hemichrysler Posted October 25, 2006 Share Posted October 25, 2006 Time to change the engine oil.What grade of oil do folks recommend (now, not in 1958) for the 392 Hemi? Engine has relatively few (I am guessing 3 or 4,000) miles since rebuild.Also, Semi-synthetic or Fully-synthetic?The engine is very infrequently started. Does anyone recommend either Slick-50 additive, or Castrol Magnatec oil (claims to adhere to metal surfaces)?Thank you.RS Link to comment Share on other sites More sharing options...
ted sweet Posted October 25, 2006 Share Posted October 25, 2006 SLICK 50 is snake oil. i would use a 15w40 disiel oil. Link to comment Share on other sites More sharing options...
Rusty_OToole Posted October 26, 2006 Share Posted October 26, 2006 I would use 10W30 like everyone else. Maybe 15W40 to mask the symptoms of a worn engine if it is bad but not in a good engine.Check the manufacturer's recommendation, they probably called for 10W30 when it was made. That was what we used in everything made in the 50s 60s and 70s.If you just did a complete rebuild synthetic may be a good idea. Depends how long you plan to keep the car, and you should check with the oil maker to find out if they recommend it for a car getting only occasional use. Link to comment Share on other sites More sharing options...
ted sweet Posted October 27, 2006 Share Posted October 27, 2006 most 10w30 doesn't have the additives to protect a flat tappet cam. Link to comment Share on other sites More sharing options...
Bob Kinker Posted October 27, 2006 Share Posted October 27, 2006 Rotella 15W40 It has the additives needed for cam/lifter protection. I use it in all my old cars!! Good stuff! Link to comment Share on other sites More sharing options...
Rusty_OToole Posted October 27, 2006 Share Posted October 27, 2006 Really!? I have driven many thousands of miles in cars with flat tappet cams (VW, Mercedes, Dodge to name a few) with ordinary 10W30 in the crankcase. Wonder what did protect them? Seems odd to me that the oil companies would overlook this point. Maybe they didn't know flat tappet cams needed extra protection. Link to comment Share on other sites More sharing options...
Rusty_OToole Posted October 27, 2006 Share Posted October 27, 2006 If we are still talking about the 392 hemi they have hydraulic lifters. I still say, 10W30 or synthetic. I think the synthetic would be better but would go by the oil manufacturer's recommendation on this. Link to comment Share on other sites More sharing options...
ted sweet Posted October 27, 2006 Share Posted October 27, 2006 the additives were removed to meet current emissions standards and prolong cat convertor life.do some reading here www.bobistheoilguy.com Link to comment Share on other sites More sharing options...
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