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Higher Grade with Higher Miles #4116183 06/05/16 07:28 PM
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Gene K Offline OP
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Any evidence to support higher grade with higher miles?

Lots of guys down south with 400,000+ mile pickups that did the 5W30 PCMO to 150,000 / 10W30 HDEO to 300,000 / 15W40 HDEO at 300,000+ type deal. Any evidence this is actually beneficial?


Gene

2014 Mustang GT 5.0 SC - 675 bhp
ST Synthetic 10W30 / FL500S

2018 F150 4x4 3.5 EB
OEM Oil & Filter

2018 Lincoln MKX 3.7
OEM Oil & Filter





Re: Higher Grade with Higher Miles [Re: Gene K] #4116198 06/05/16 07:48 PM
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Ethan1 Offline
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I'm not sure how we would gather "evidence", per se, but there are plenty of anecdotes about "looser tolerances" on older trucks.

Re: Higher Grade with Higher Miles [Re: Gene K] #4116218 06/05/16 08:07 PM
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tig1 Online Content
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No.


2007 Ford Fusion 246,000 miles
M1 5-20HM
2017 Ford Fusion 75K
M1 0-20EP
10,000 mile OCIs on both engines
M1 ATF and Valvoline LV
M1 10-30 in all OPE
MC filters

Re: Higher Grade with Higher Miles [Re: Gene K] #4116220 06/05/16 08:12 PM
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crazyoildude Offline
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heavy oil is not always better.. going up one grade from say 5w20 to 5w30 may not be so bad on most engines.


Check To See That The Oil Jugs You Buy Have The Exact Amount Of Oil In Them And Have An Inner Seal Under The Cap. I Use Mobil 1 And Fram Ultra Filters
Re: Higher Grade with Higher Miles [Re: Gene K] #4116224 06/05/16 08:15 PM
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demarpaint Offline
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I'd move up a grade with higher miles if I started to use oil, otherwise I'd leave it alone.


God Bless Our Troops

Re: Higher Grade with Higher Miles [Re: Gene K] #4116233 06/05/16 08:23 PM
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crazyoildude Offline
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What engines?


Check To See That The Oil Jugs You Buy Have The Exact Amount Of Oil In Them And Have An Inner Seal Under The Cap. I Use Mobil 1 And Fram Ultra Filters
Re: Higher Grade with Higher Miles [Re: Gene K] #4116316 06/05/16 10:22 PM
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DoubleWasp Offline
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OEM's have been moving up a grade on a lot of brand new engines recently.

Dont think it will harm an older one.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Higher Grade with Higher Miles [Re: Gene K] #4116350 06/05/16 11:27 PM
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BrocLuno Offline
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Originally Posted By: Gene K
Any evidence to support higher grade with higher miles?

Lots of guys down south with 400,000+ mile pickups that did the 5W30 PCMO to 150,000 / 10W30 HDEO to 300,000 / 15W40 HDEO at 300,000+ type deal. Any evidence this is actually beneficial?



That sort of run-up has always worked for me. But I don't have any cars or light trucks that have recently made it over 287,000 miles. Not because they were not running fine (they were), but at that point they would no longer pass Calif SMOG testing w/o a new cat and the vehicles were not worth it ...

The '62 Ford F-100 went 400K plus doing that sort of oil up-grade. But that was many years ago ...

Last edited by BrocLuno; 06/05/16 11:29 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Higher Grade with Higher Miles [Re: Gene K] #4116351 06/05/16 11:27 PM
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SuperDave456 Offline
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Define "Higher Mileage"
100,000 miles is just broken in.
200,000 miles is starting to sound like "higher mileage"
300,000 mileage run what suits your fancy, you got your money and then some out of her.

Re: Higher Grade with Higher Miles [Re: Gene K] #4116352 06/05/16 11:30 PM
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zeng Offline
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Plain bearings with abrasion scratches over times,even if bearing clearances hasn't enlarged, would require higher operating viscosity at similar conditions of engine rpm and load than an original bearings.........
just to maintain similar MOFT, and by extension film strength. blush

It makes sense to up a grade or two for used bearings ..... and used interfaces at cylinder liners and cams.

Edit:spelling

Last edited by zeng; 06/05/16 11:31 PM.
Re: Higher Grade with Higher Miles [Re: Gene K] #4116357 06/05/16 11:45 PM
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3800Series Offline
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I had a old Volvo with 289k miles had bad compression but refused to die. Pretty much everything that could break on this car had by the time two of my son's had it as there first car.

It leaked and rattled decided one day to try 10w50 (or 15w50 been several years back) anyways the car became dead silent. You could stand by the hood and wouldn't know if it was running after the thicker oil was added.

But I also had a '01 Chevy 1500 with 360k miles and it ran perfectly fine till the day it blew the head gasket. Used 10w30 and 7,500 mile OCI it's whole life.

I guess it would really just depend on the vehicle.

Re: Higher Grade with Higher Miles [Re: zeng] #4116397 06/06/16 01:49 AM
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UltrafanUK Offline
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Originally Posted By: zeng
Plain bearings with abrasion scratches over times,even if bearing clearances hasn't enlarged, would require higher operating viscosity at similar conditions of engine rpm and load than an original bearings.........
just to maintain similar MOFT, and by extension film strength. blush

It makes sense to up a grade or two for used bearings ..... and used interfaces at cylinder liners and cams.


CORRECT!

One easy way to figure out if the engine is worn is to keep track of the oil consumption figures. In general terms I would only move up one grade from OEM spec, BUT I would find out what that spec was for use outside the USA, as the one quoted from a US site might be biased by fuel economy regulations.

It also helps with an old worn engine to use an oil with more anti wear additives and detergents, although I would only switch to an HM oil when the oil consumption increases.

It's also very important to select an OCI that matches the condition and use of the engine, as older engines tend to contaminate their oil more. The best way to figure out what the OCI should be for an older engine, is to get a used oil analysis (UOA) done.

Last edited by UltrafanUK; 06/06/16 02:01 AM.
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