20w-40

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May 19, 2004 | 09:18 AM

FERacing66

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From: Jackassville

20w-40

yeah it gets really hot around here and i heard from 2 mechanis that 20-40 is the best bet for hot weather in truks and in motorcycles. what do you folks think?

May 19, 2004 | 09:58 AM

jimandmandy

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From: Running Springs CA

20W-40 is an obsolete grade that I havent seen in 20 years. 15W-40 is pretty much the replacement. Shell Rotella T 15W-40 is very popular in motorcyles and I would use it without hesitation in older truck engines, not in a new one under warranty that requires 5W-20. Chevron Delo 400 is my favorite oil in that grade.

Jim

May 19, 2004 | 12:32 PM

Texan1983

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From: Des Moines, Iowa

20w50 is out now

May 19, 2004 | 02:58 PM

jimandmandy

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From: Running Springs CA

The question was about 20W-40 not 20W-50, unless it was a typo.

Jim

May 20, 2004 | 12:27 AM

Texan1983

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From: Des Moines, Iowa

i know, i was just letting him know that there is a 20w50 as another option and that might be what they were talking about or at least close. but yea 20w40 is obsolete

May 20, 2004 | 11:04 PM

TallPaul

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From: Metro Detroit (Redford)

But now I wonder if you could still get 20w40 in a motorcycle oil?

May 21, 2004 | 01:17 PM

jimandmandy

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From: Running Springs CA

The motorcyle-specific oils I have seen are 10W-40 for Japanese bikes or 20W-50 for Harleys. They cost more just because they are "specialty" products.

Jim

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May 21, 2004 | 09:58 PM

TallPaul

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From: Metro Detroit (Redford)

Quote:

Originally Posted by TritonV10

25w-40 Mercruiser oil at Walmart will stay in grade too .

Now that sounds like a nice summer grade for my 300 I6. I wonder if the ol' 300 ever got put in boats.

May 22, 2004 | 05:31 PM

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FERacing66

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From: Jackassville

well its for a bike. they only reccomend using 20-40 for hot weather instead of 15-40. would it hurt anything if i used 15-40? yamaha wants 4 bucks a quart for the stuff. i have only seen 20-40 in the yamaha dealer and no where else. i dont want to screw up my bike with a different weight of oil they didnt reccomend. yamaha wants 10W-30 in the winter and 20-40 in the summer.