Myth's and Facts oil & atf link a good read.
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I call complete bull on this one:
Quote:
Synthetic oil lasts longer than conventional oil or extends the oil drain interval.
You can go longer (i.e., 25000 miles) with synthetic oils.
Using synthetic motor oils can double your oil drain interval.
Synthetic motor oils can be used twice as long as conventional motor oils.
Changing only your oil filter every 3000 miles and topping off the oil can extend drain intervals.
Fact
We do not recommend extending oil drain intervals beyond the “severe service” maintenance interval of three months or 3,000 miles, whichever comes first. Also, we are unaware of any automobile manufacturer in the United States that currently recognizes using any synthetic oil beyond the recommended oil change intervals outlined in their owner’s manual. We emphasize severe service since the majority of motor vehicles are operated in severe driving conditions such as short trips (under 10 miles), dusty or sandy conditions, cold weather, extended idling periods, trailer towing or other harsh conditions. Under ideal conditions, however, such as a dust-free climate, highway driving, light loads, perfect engine performance, etc., the oil drain interval may be extended to the vehicle manufacturer’s recommended “normal service” period (generally between 3,000 to 7,500 miles). Contamination by normal wear particles, water, fuel, and other combustion by-products, as well as additive depletion, are the main reasons for changing conventional oils on a regular basis. Synthetic oils are equally susceptible to this problem. The only way to remove these contaminants is to change the oil and filter within manufacturers’ recommended intervals.
While it is desirable to change the oil filter before it plugs up because of dirt and contaminant build-up, it is nearly impossible to detect when that condition exists or is about to occur. Regardless of how good an oil filter appears to be, it only makes good sense to change the oil filter at every oil change.
I think there is plenty in this site that argues against this. And the OLMs in both my GM vehicles argue against "We do not recommend extending oil drain intervals beyond the 'severe service' maintenance interval of three months or 3,000 miles, whichever comes first." I trust the maker of my vehicles and the combined 320k+ miles between the two of them following the OLMs than I do an oil wholesaler who benefits from me changing the oil twice as often as when I follow the OLM.
Quote:
Synthetic oil lasts longer than conventional oil or extends the oil drain interval.
You can go longer (i.e., 25000 miles) with synthetic oils.
Using synthetic motor oils can double your oil drain interval.
Synthetic motor oils can be used twice as long as conventional motor oils.
Changing only your oil filter every 3000 miles and topping off the oil can extend drain intervals.
Fact
We do not recommend extending oil drain intervals beyond the “severe service” maintenance interval of three months or 3,000 miles, whichever comes first. Also, we are unaware of any automobile manufacturer in the United States that currently recognizes using any synthetic oil beyond the recommended oil change intervals outlined in their owner’s manual. We emphasize severe service since the majority of motor vehicles are operated in severe driving conditions such as short trips (under 10 miles), dusty or sandy conditions, cold weather, extended idling periods, trailer towing or other harsh conditions. Under ideal conditions, however, such as a dust-free climate, highway driving, light loads, perfect engine performance, etc., the oil drain interval may be extended to the vehicle manufacturer’s recommended “normal service” period (generally between 3,000 to 7,500 miles). Contamination by normal wear particles, water, fuel, and other combustion by-products, as well as additive depletion, are the main reasons for changing conventional oils on a regular basis. Synthetic oils are equally susceptible to this problem. The only way to remove these contaminants is to change the oil and filter within manufacturers’ recommended intervals.
While it is desirable to change the oil filter before it plugs up because of dirt and contaminant build-up, it is nearly impossible to detect when that condition exists or is about to occur. Regardless of how good an oil filter appears to be, it only makes good sense to change the oil filter at every oil change.
I think there is plenty in this site that argues against this. And the OLMs in both my GM vehicles argue against "We do not recommend extending oil drain intervals beyond the 'severe service' maintenance interval of three months or 3,000 miles, whichever comes first." I trust the maker of my vehicles and the combined 320k+ miles between the two of them following the OLMs than I do an oil wholesaler who benefits from me changing the oil twice as often as when I follow the OLM.
Originally Posted By: NMBurb02
I call complete bull on this one:
Quote:
Synthetic oil lasts longer than conventional oil or extends the oil drain interval.
You can go longer (i.e., 25000 miles) with synthetic oils.
Using synthetic motor oils can double your oil drain interval.
Synthetic motor oils can be used twice as long as conventional motor oils.
Changing only your oil filter every 3000 miles and topping off the oil can extend drain intervals.
Fact
We do not recommend extending oil drain intervals beyond the “severe service” maintenance interval of three months or 3,000 miles, whichever comes first. Also, we are unaware of any automobile manufacturer in the United States that currently recognizes using any synthetic oil beyond the recommended oil change intervals outlined in their owner’s manual. We emphasize severe service since the majority of motor vehicles are operated in severe driving conditions such as short trips (under 10 miles), dusty or sandy conditions, cold weather, extended idling periods, trailer towing or other harsh conditions. Under ideal conditions, however, such as a dust-free climate, highway driving, light loads, perfect engine performance, etc., the oil drain interval may be extended to the vehicle manufacturer’s recommended “normal service” period (generally between 3,000 to 7,500 miles). Contamination by normal wear particles, water, fuel, and other combustion by-products, as well as additive depletion, are the main reasons for changing conventional oils on a regular basis. Synthetic oils are equally susceptible to this problem. The only way to remove these contaminants is to change the oil and filter within manufacturers’ recommended intervals.
While it is desirable to change the oil filter before it plugs up because of dirt and contaminant build-up, it is nearly impossible to detect when that condition exists or is about to occur. Regardless of how good an oil filter appears to be, it only makes good sense to change the oil filter at every oil change.
I think there is plenty in this site that argues against this. And the OLMs in both my GM vehicles argue against "We do not recommend extending oil drain intervals beyond the 'severe service' maintenance interval of three months or 3,000 miles, whichever comes first." I trust the maker of my vehicles and the combined 320k+ miles between the two of them following the OLMs than I do an oil wholesaler who benefits from me changing the oil twice as often as when I follow the OLM.
I would venture to guess with many OLMs (minders) the "severe service" cyle would put you right around 5,000 miles than the 3,000 miles as mentioned. But I'm only guessing.
I call complete bull on this one:
Quote:
Synthetic oil lasts longer than conventional oil or extends the oil drain interval.
You can go longer (i.e., 25000 miles) with synthetic oils.
Using synthetic motor oils can double your oil drain interval.
Synthetic motor oils can be used twice as long as conventional motor oils.
Changing only your oil filter every 3000 miles and topping off the oil can extend drain intervals.
Fact
We do not recommend extending oil drain intervals beyond the “severe service” maintenance interval of three months or 3,000 miles, whichever comes first. Also, we are unaware of any automobile manufacturer in the United States that currently recognizes using any synthetic oil beyond the recommended oil change intervals outlined in their owner’s manual. We emphasize severe service since the majority of motor vehicles are operated in severe driving conditions such as short trips (under 10 miles), dusty or sandy conditions, cold weather, extended idling periods, trailer towing or other harsh conditions. Under ideal conditions, however, such as a dust-free climate, highway driving, light loads, perfect engine performance, etc., the oil drain interval may be extended to the vehicle manufacturer’s recommended “normal service” period (generally between 3,000 to 7,500 miles). Contamination by normal wear particles, water, fuel, and other combustion by-products, as well as additive depletion, are the main reasons for changing conventional oils on a regular basis. Synthetic oils are equally susceptible to this problem. The only way to remove these contaminants is to change the oil and filter within manufacturers’ recommended intervals.
While it is desirable to change the oil filter before it plugs up because of dirt and contaminant build-up, it is nearly impossible to detect when that condition exists or is about to occur. Regardless of how good an oil filter appears to be, it only makes good sense to change the oil filter at every oil change.
I think there is plenty in this site that argues against this. And the OLMs in both my GM vehicles argue against "We do not recommend extending oil drain intervals beyond the 'severe service' maintenance interval of three months or 3,000 miles, whichever comes first." I trust the maker of my vehicles and the combined 320k+ miles between the two of them following the OLMs than I do an oil wholesaler who benefits from me changing the oil twice as often as when I follow the OLM.
I would venture to guess with many OLMs (minders) the "severe service" cyle would put you right around 5,000 miles than the 3,000 miles as mentioned. But I'm only guessing.
Originally Posted By: NMBurb02
I call complete bull on this one:
Quote:
Synthetic oil lasts longer than conventional oil or extends the oil drain interval.
You can go longer (i.e., 25000 miles) with synthetic oils.
Using synthetic motor oils can double your oil drain interval.
Synthetic motor oils can be used twice as long as conventional motor oils.
Changing only your oil filter every 3000 miles and topping off the oil can extend drain intervals.
Fact
We do not recommend extending oil drain intervals beyond the “severe service” maintenance interval of three months or 3,000 miles, whichever comes first. Also, we are unaware of any automobile manufacturer in the United States that currently recognizes using any synthetic oil beyond the recommended oil change intervals outlined in their owner’s manual. We emphasize severe service since the majority of motor vehicles are operated in severe driving conditions such as short trips (under 10 miles), dusty or sandy conditions, cold weather, extended idling periods, trailer towing or other harsh conditions. Under ideal conditions, however, such as a dust-free climate, highway driving, light loads, perfect engine performance, etc., the oil drain interval may be extended to the vehicle manufacturer’s recommended “normal service” period (generally between 3,000 to 7,500 miles). Contamination by normal wear particles, water, fuel, and other combustion by-products, as well as additive depletion, are the main reasons for changing conventional oils on a regular basis. Synthetic oils are equally susceptible to this problem. The only way to remove these contaminants is to change the oil and filter within manufacturers’ recommended intervals.
While it is desirable to change the oil filter before it plugs up because of dirt and contaminant build-up, it is nearly impossible to detect when that condition exists or is about to occur. Regardless of how good an oil filter appears to be, it only makes good sense to change the oil filter at every oil change.
I think there is plenty in this site that argues against this. And the OLMs in both my GM vehicles argue against "We do not recommend extending oil drain intervals beyond the 'severe service' maintenance interval of three months or 3,000 miles, whichever comes first." I trust the maker of my vehicles and the combined 320k+ miles between the two of them following the OLMs than I do an oil wholesaler who benefits from me changing the oil twice as often as when I follow the OLM.
It's kinda tough because engines too have changed quite a bit n the last few years. Many more turbo engines now, which are hard on oil in general...
I call complete bull on this one:
Quote:
Synthetic oil lasts longer than conventional oil or extends the oil drain interval.
You can go longer (i.e., 25000 miles) with synthetic oils.
Using synthetic motor oils can double your oil drain interval.
Synthetic motor oils can be used twice as long as conventional motor oils.
Changing only your oil filter every 3000 miles and topping off the oil can extend drain intervals.
Fact
We do not recommend extending oil drain intervals beyond the “severe service” maintenance interval of three months or 3,000 miles, whichever comes first. Also, we are unaware of any automobile manufacturer in the United States that currently recognizes using any synthetic oil beyond the recommended oil change intervals outlined in their owner’s manual. We emphasize severe service since the majority of motor vehicles are operated in severe driving conditions such as short trips (under 10 miles), dusty or sandy conditions, cold weather, extended idling periods, trailer towing or other harsh conditions. Under ideal conditions, however, such as a dust-free climate, highway driving, light loads, perfect engine performance, etc., the oil drain interval may be extended to the vehicle manufacturer’s recommended “normal service” period (generally between 3,000 to 7,500 miles). Contamination by normal wear particles, water, fuel, and other combustion by-products, as well as additive depletion, are the main reasons for changing conventional oils on a regular basis. Synthetic oils are equally susceptible to this problem. The only way to remove these contaminants is to change the oil and filter within manufacturers’ recommended intervals.
While it is desirable to change the oil filter before it plugs up because of dirt and contaminant build-up, it is nearly impossible to detect when that condition exists or is about to occur. Regardless of how good an oil filter appears to be, it only makes good sense to change the oil filter at every oil change.
I think there is plenty in this site that argues against this. And the OLMs in both my GM vehicles argue against "We do not recommend extending oil drain intervals beyond the 'severe service' maintenance interval of three months or 3,000 miles, whichever comes first." I trust the maker of my vehicles and the combined 320k+ miles between the two of them following the OLMs than I do an oil wholesaler who benefits from me changing the oil twice as often as when I follow the OLM.
It's kinda tough because engines too have changed quite a bit n the last few years. Many more turbo engines now, which are hard on oil in general...
Although 99% of all engines don't require 3K drains 99% of the time using current oils and fuels, the rest of this piece contains a lot of good and valid information.
Recommended reading for those new to the concept of oil being something more than the name brand on the bottle and a better basic primer than Oil 101, which is itself a piece of vintage mythology.
Recommended reading for those new to the concept of oil being something more than the name brand on the bottle and a better basic primer than Oil 101, which is itself a piece of vintage mythology.
4WD
$50 site donor 2025
On the 5.3L - with DFI etc - perhaps GM changed a bit more than they tend to per model year or so ... I wonder if they'd just increased sump capacity with 5w30 (not a 20) if severe could have been more liberal.
I struggle with a big blocky double cab realizing serious MPG gains with 20's ...
I struggle with a big blocky double cab realizing serious MPG gains with 20's ...
JHZR2
Staff member
Originally Posted By: CKN
I would venture to guess with many OLMs (minders) the "severe service" cyle would put you right around 5,000 miles than the 3,000 miles as mentioned. But I'm only guessing.
+1
Ive not found the severe service interval to be meaningful, via objective evidence (e.g. UOA and longevity), even with commutes as short as five blocks.
I would venture to guess with many OLMs (minders) the "severe service" cyle would put you right around 5,000 miles than the 3,000 miles as mentioned. But I'm only guessing.
+1
Ive not found the severe service interval to be meaningful, via objective evidence (e.g. UOA and longevity), even with commutes as short as five blocks.
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