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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: Jan 2010 Posts: 210 'Bolter | | 'Bolter Joined: Jan 2010 Posts: 210 | Hello, What kind of oil should I be using in my stock 1946 235ci? I've only had the truck for a few months and I used straight 30 when I changed oil. Thanks | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | 20 or 30 weight non detergent (if you can find it) in an old used engine is just fine. I use 15w40 synthetic in mine. Everyone has an opinion on this and it has been discussed to death so I recommend you do a search on engine oil. | | | | | Joined: Feb 2004 Posts: 29,878 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,878 | The only drawback to straight 30 is cold starting. The oil is about the consistency of honey at 30 degrees or below, so it's rough on starters, and the bearings run with limited lube for a while until the pressure gets to them. I like to run 20W-50, which flows like a 20W when cold, and lubricates like a 50 weight when hot. BTW the "W" indicates "winter" not "weight". "W" rated oils are flow-tested at 32 degrees F. There's no such thing as a 30W motor oil. Always use high-detergent HD30 if you choose to stick with a straight-weight oil, not the low-quality non-detergent oil that's intended mostly for worn-out oil burners. The old myth about detergent oil being bad for stovebolts still has a few true believers!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jul 2008 Posts: 176 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2008 Posts: 176 | | | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | I think you should look at the area in which you live to make most logical decision. Around my area I run 10w30 all the time. Just recently I ask a long time service manager what kind of oil they are putting in their cars here in MY AREA since the oil caps all say 5-30 and his reply was "in this area we use nothing but 10w30".
So, look at the temperature extremes and go from there. | | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | | | |
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