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Mod | | | Forums66 Topics128,128 Posts1,056,358 Members48,441 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2005 Posts: 170 Member | | Member Joined: Mar 2005 Posts: 170 | I bought my '66 C10 about 4 months ago. It has a late model GM 350 crate motor. I would guess that it is no more than 4-5 years old and has less than 10K miles on it.
Does anyone know what weight oil is recommended in these new crate motors? I'm running Castrol GTX 10w-30 right now. I'm would like to run Mobile 1, 5w-30 if that would be OK. I didn't get any motor paper work with the truck, so I don't know what the factory reccomendation is.
Thanks,
Steve | | | | | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | I put one in a friend's 84 C10 a couple years back, GM recommended 10w30. Brian | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | I just put one in my 70 stepside. The oil cap says 10w30 but I use 5w30 in all my good stuff. Runs great.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Aug 2004 Posts: 1,067 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 1,067 | I wouldn't suggest a synthetic oil until you've got at least 2500 miles on it. That is usually the manufacturer's recommendation too. Until then, 10W30 fossil oil is the best stuff to use.
52 GMC 3/4 ton pickup
68 Big Block Vette
68 455 Firebird
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