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#2178297 - 02/22/11 11:45 AM 88 K5 Blazer- What oil to use?
OSDCrusher Offline


Registered: 02/22/11
Posts: 19
Loc: Massachusetts
Hello all. Been lurking around the forums for weeks now and have became obsessed with engine oil LOL. Ok, so I am coming up on my first oil change on my 1988 K5 Blazer, 350 TBI 80,145 miles.
I am unsure what type of oil to use, 10W30, 10W40, high mileage?
The engine was not properly maintained by previous owner, there is some sludge in the engine and the oil filler cap was black with sludge on it. Could I get some advice or suggestions about what oil to run in the Blazer for the summer? The weather is going to start to get warm in 2-3 months.

1. What kind of vehicle you have- 1988 K5 Blazer
2. What your owner's manual says -- not just viscosity, but certifications (look for acronyms like API SM, ILSAC GF-4, etc.) and change intervals as well- 10W30 Energy Conserving
3. Where you live- Massachusetts
4. How you drive (easy? hard? fast? slow?)- Usually take it slow, but sometimes for fun I push it
5. What your daily drive is like (short trips? long trips? city? highway?)- Take it out once or twice a weekend to give it a run. Short to medium trip length.
6. Whether your car has any known problems- I notice some blue smoke coming out of tailpipe when I start it up.

Thanks,
Nick


Edited by OSDCrusher (02/22/11 11:51 AM)
Edit Reason: Added information
_________________________
2007 Ford Focus SES- 2.0L, 44K
Motorcraft Synthetic Blend 5W20
Motorcraft Filter

1996 Dodge Ram 1500 4x4- 5.2L, 146K
Mopar MaxPro 10W30
Motorcraft Filter

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#2178302 - 02/22/11 11:49 AM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
addyguy Offline


Registered: 09/08/05
Posts: 14026
Loc: Canada
Run a few fills of 15W-40 HDEO, and substitute 1 quart of oil for a quart of MMO. Do this for 2-3 fills in a row, and run them for 2-3k each.

That will help clean up the engine a lot.
_________________________
2010 Kia Soul 2U - 2.0L I-4, auto; 97k miles.
Castrol GTX 5W-30; MPH 9688 filter.

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#2178304 - 02/22/11 11:53 AM Re: 88 K5 Blazer- What oil to use? [Re: addyguy]
OSDCrusher Offline


Registered: 02/22/11
Posts: 19
Loc: Massachusetts
Isn't 15W40 an oil for diesel engines?


Edited by OSDCrusher (02/22/11 12:07 PM)
_________________________
2007 Ford Focus SES- 2.0L, 44K
Motorcraft Synthetic Blend 5W20
Motorcraft Filter

1996 Dodge Ram 1500 4x4- 5.2L, 146K
Mopar MaxPro 10W30
Motorcraft Filter

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#2178311 - 02/22/11 12:07 PM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
umungus1122 Offline


Registered: 02/12/08
Posts: 834
Loc: PA
15w-40 in the summer is fine in a 350. Besides, the MMO will thin it out some. You could use a 10w-30 HDEO if you want to go thinner.
_________________________
'95 Chevy 1/2t 305 200k - QS DEFY 5w-20, CARQUEST Red(wix made) filter
'89 Jeep Comanche 4.0 278k - GC 0w-30, Bosch LongLife filter

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#2178313 - 02/22/11 12:08 PM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
OSDCrusher Offline


Registered: 02/22/11
Posts: 19
Loc: Massachusetts
Alright, well what is the 15W-40 going to do to the engine that the 10W30 won't?
_________________________
2007 Ford Focus SES- 2.0L, 44K
Motorcraft Synthetic Blend 5W20
Motorcraft Filter

1996 Dodge Ram 1500 4x4- 5.2L, 146K
Mopar MaxPro 10W30
Motorcraft Filter

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#2178329 - 02/22/11 12:23 PM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
bepperb Offline


Registered: 01/10/08
Posts: 4966
Loc: Milwaukee, WI
Personally, I'd seek out a HDEO like Rotella 10-30. That give you the cleaning of a diesel oil in the viscosity you want without the MMO.

Otherwise some short intervals of any good conventional 10-30 will probably fix the sludge over time.
_________________________
2004 Highlander 2.4
2011 Toyota Sienna 3.5
Recently Gone:
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#2178332 - 02/22/11 12:25 PM Re: 88 K5 Blazer- What oil to use? [Re: bepperb]
OSDCrusher Offline


Registered: 02/22/11
Posts: 19
Loc: Massachusetts
Originally Posted By: bepperb
Personally, I'd seek out a HDEO like Rotella 10-30. That give you the cleaning of a diesel oil in the viscosity you want without the MMO.

Otherwise some short intervals of any good conventional 10-30 will probably fix the sludge over time.


I think I will use High Mileage 10W30 and see what happens. Anyone have a recommendations for a brand? How about a filter?
_________________________
2007 Ford Focus SES- 2.0L, 44K
Motorcraft Synthetic Blend 5W20
Motorcraft Filter

1996 Dodge Ram 1500 4x4- 5.2L, 146K
Mopar MaxPro 10W30
Motorcraft Filter

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#2178355 - 02/22/11 12:41 PM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
dave1251 Offline


Registered: 07/15/05
Posts: 8361
Loc: Maricopa, AZ
I would use Rotella 5W-40 in that 5.7 and 5K OCI'S for the first couple of oil changes. Push-rod GM V8's seem to tolerate heavier oils.
_________________________
make the inside of your engine oil cap white.
don't use.

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#2178359 - 02/22/11 12:45 PM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
dave1251 Offline


Registered: 07/15/05
Posts: 8361
Loc: Maricopa, AZ
If you want to go with the high mileage route nothing to worry about there use any brand you find on sale. Max-life is the best selling. But in the long run choice you make will give you the same results. As for filters I would go with a Napa Gold or even a supertech e-core. That motor should last a lot longer if your cooling and filtraton system is properly maintained.
_________________________
make the inside of your engine oil cap white.
don't use.

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#2178360 - 02/22/11 12:46 PM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
bubbatime Offline


Registered: 03/18/08
Posts: 4026
Loc: South Florida
Shell Rotella 10w30 is a good high quality oil.
http://shop.advanceautoparts.com/webapp/...;ci_sku=8120024

Or Valvoline Maxlife 5w30/10w30 is what I would use.
http://shop.advanceautoparts.com/webapp/...19B_T%7CGRP2046
_________________________
13 Yamaha XT250 Valvoline Motorcycle 10W40
10 Acura TSX 2.4 Mobil 1 5W30 syn
09 Chrysler TC 4.0 Chevron 10W30
06 GMC Sierra 4.8 Chevron 10W30



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#2178361 - 02/22/11 12:47 PM Re: 88 K5 Blazer- What oil to use? [Re: addyguy]
TooManyWheels Offline


Registered: 02/21/03
Posts: 3710
Loc: Houston, Tex
Originally Posted By: addyguy
Run a few fills of 15W-40 HDEO, and substitute 1 quart of oil MMO for a quart of MMO oil. Do this for 2-3 fills in a row, and run them for 2-3k each.

That will help clean up the engine a lot.

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#2178364 - 02/22/11 12:50 PM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
mongo161 Offline


Registered: 07/11/10
Posts: 3589
Loc: Ponte Vedra Beach, FL
Seems like most of the people like this Valvoline HM in synthetic blend. You could also use Pennzoil Dino HM oils or the SuperTech Dino HM oils.

I've seen the Pennzoil in heavy weights of 10W-30 and 10W-40 at Walmart along with the SuperTech Dino and Valvoline HM Synthetic blend oil. They also carry the MMO in quart bottles and sometimes gallons.

If your going to run the oil for short intervals then any low cost filter that your select would fit the bill. Get whatever is on sale or the cheapest price and make your decisions accordingly. Good luck and let us know how you make out.
_________________________
I get by with a little help from my friends....listen with your eyes....it's the ONLY way to believe what you hear...

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#2178373 - 02/22/11 01:05 PM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
SuperFast Offline


Registered: 01/11/11
Posts: 397
Loc: California
Originally Posted By: OSDCrusher
Originally Posted By: bepperb
Personally, I'd seek out a HDEO like Rotella 10-30. That give you the cleaning of a diesel oil in the viscosity you want without the MMO.

Otherwise some short intervals of any good conventional 10-30 will probably fix the sludge over time.


I think I will use High Mileage 10W30 and see what happens. Anyone have a recommendations for a brand? How about a filter?


Maxlife.

Also, yeah 10W-30 OR 10W-40.. i think it said to use 10W-30 when new, most ppl with Chevys use that.

Some use 10W-40 some even use 20W-50 (!) but in reality, all three grades or thee first two might be ok.

MAKE SURE ITS A HIGH MILES OIL!!!

Hope this helps. (I have a Chevy and most people use 10W-30 in it. Same 8"Era" as your truck. has a carb)

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#2178399 - 02/22/11 01:32 PM Re: 88 K5 Blazer- What oil to use? [Re: OSDCrusher]
OSDCrusher Offline


Registered: 02/22/11
Posts: 19
Loc: Massachusetts
Wow, thank you all for the very informative replies! It looks like I will be using MaxLife 10W0-40 with a supertech filter.
_________________________
2007 Ford Focus SES- 2.0L, 44K
Motorcraft Synthetic Blend 5W20
Motorcraft Filter

1996 Dodge Ram 1500 4x4- 5.2L, 146K
Mopar MaxPro 10W30
Motorcraft Filter

Top
#2178404 - 02/22/11 01:36 PM Re: 88 K5 Blazer- What oil to use? [Re: addyguy]
demarpaint Offline


Registered: 07/03/05
Posts: 26803
Loc: NY
Originally Posted By: addyguy
Run a few fills of 15W-40 HDEO, and substitute 1 quart of oil for a quart of MMO. Do this for 2-3 fills in a row, and run them for 2-3k each.

That will help clean up the engine a lot.


+1 That should work well.
_________________________
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