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Old 04-16-2004, 10:39 PM   #1
Dealer Xing
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Default Anybody uses 15W-40W motor oil? Is it for trucks only?

Has anybody noticed that the 15W-40W motor oil on the market is usually recommended for trucks or diesel engine(It says on the bottle)? I think it would be a good viscosity for me to use on a turbocharged car(non-subaru). I don't know if it is solely for trucks to use.
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Old 04-16-2004, 10:53 PM   #2
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bad idea; try 10w40 (std or synthetic) or 5w40 synthetic instead. many many high performance engines in cars and motorcycles use those.

15w cold is going to be not teh good on your valvegear when cold starting if you are somewhere that gets <40 degrees.
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Old 04-16-2004, 10:54 PM   #3
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btw, why is this an OT thread???
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Old 04-16-2004, 11:19 PM   #4
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15-50W on teh Jetta. Runs great.

Granted, I don't get tons of cold weather although the car does seem to like it more than hot weather.
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Old 04-17-2004, 07:58 AM   #5
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What kind of 15W-50 do you use? Mobil 1?

Quote:
Originally posted by DrBiggly
15-50W on teh Jetta. Runs great.

Granted, I don't get tons of cold weather although the car does seem to like it more than hot weather.
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Old 04-17-2004, 08:09 AM   #6
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I use Mobil One 15W-50 in my Galant VR4 pushing 24psi.
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Old 04-17-2004, 09:52 AM   #7
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I know someone with an old BMW 525i that runs 15W-40(50?) Mobil 1. Those are $$$ oil changes.
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Old 04-17-2004, 09:53 AM   #8
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I use 0-40 Mobil 1 in the M3. 7-8 qts of that stuff each time is pricey, but at least I can go 10k mi before changing it.
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Old 04-17-2004, 10:11 AM   #9
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Quote:
Originally posted by Dealer Xing
What kind of 15W-50 do you use? Mobil 1?
Mobil 1. I figure with 205k on the clock it's best not to change the oil now for fear the car would just reject it horribly after a transplant of anything else.
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Old 04-17-2004, 10:21 AM   #10
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I ran John Deere 15W-40 synth in my Supra Turbo every summer (yes, for hard working turbo diesels). Probably just rebadged Mobil. The car absolutely loved it. Wife and I put 160k on the car before some redneck backed into it and totaled it out.
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Old 04-17-2004, 10:26 AM   #11
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I think I recall reading that Gary was running 15W50 or 20W50 in his USTCC car. Of course, that engine is living at a different point on the curve than a street engine...
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Old 04-17-2004, 10:56 AM   #12
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I run 10-40 Syntec now but will be switching to 15-50 next change. Probably Mobil 1.

Totally the wrong forum!
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Old 04-17-2004, 12:39 PM   #13
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we can get away with 20w-50 down here uber protection!
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Old 04-17-2004, 12:54 PM   #14
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I used to run 15W40 in my VW jetta in NH in the summer, then switched to 10W40 for the colder months, ran both great.
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Old 04-17-2004, 02:04 PM   #15
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Quote:
Originally posted by RidinLow
I use 0-40 Mobil 1 in the M3. 7-8 qts of that stuff each time is pricey, but at least I can go 10k mi before changing it.
what he said. the bike uses 10w40 mobil1.

unloved taurus gets 10w30 castrol gtx
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Old 04-17-2004, 02:46 PM   #16
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Diesel formulation oils are ultra high detergent. This may or may not be a good thing, depending on your engine.

Other than that, I don't see anything wrong with that viscosity range for warmer months.

Joe
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Old 04-17-2004, 02:49 PM   #17
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I've been running Rotella T synthetic 5-40 in my motorcycle for a while and I really like it. Motor is a bit quieter, and the shifting is greatly improved over the old dino stuff.
It's marketed as a "fleet oil", and is suitable for diesel or gas engines. It doesn't have the friction modifiers in it that most automotive oils have these days, so it doesn't pose issues with the cycles wet clutch. Plus I can get a gallon of the stuff at Wal Mart for the 2 bucks more than one quart of Mobil One for motorcycles.
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Old 04-17-2004, 04:03 PM   #18
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Quote:
Originally posted by DrBiggly
15-50W on teh Jetta. Runs great.

Granted, I don't get tons of cold weather although the car does seem to like it more than hot weather.
your oil is too thick for when it is not hot, you need to run what the manufacturer recommends, it's actually slowin you down when it's a nice and cool outside, when the motor should be runnin it's best
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Old 04-17-2004, 05:18 PM   #19
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15 weight is not too thick for north carolina.
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Old 04-17-2004, 07:27 PM   #20
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Quote:
Originally posted by Projekt
15 weight is not too thick for north carolina.
w3rd.

0W is called for in the winter time on the Great Plains.

Nothing more than 10W in the summAr.
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Old 04-17-2004, 08:47 PM   #21
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Quote:
Originally posted by Projekt
15 weight is not too thick for north carolina.
it's not the 15 it's the 50, it's too thick
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