Guest windjamer Posted May 13, 2008 Share Posted May 13, 2008 1965 401 v8, rebuilt.Filled with 5wt. hd. and run about 1/2 hr. Drained and refilled with 10/30. Engine now has about 600. miles. I want to draun and refill w/new filter, would you use 5w20,--5w30,or 10w30. Link to comment Share on other sites More sharing options...
Ted "Wildcat65" Nagel Posted May 13, 2008 Share Posted May 13, 2008 I just started using this 10w 30 in my Riviera...They make a 30w break in oil, recommended for flat tappet apps. I was at AMP (the Automotive Machine and Performance shop= Buick engine builders) and they use this stuff on their engines. http://cgi.ebay.com/ebaymotors/BRAD-PENN...sspagenameZWDVW Link to comment Share on other sites More sharing options...
Guest brh Posted May 13, 2008 Share Posted May 13, 2008 On a fresh rebuild I'd run 10W 30, as I recall the 5w came into play with the tighter engine tolerances in the 80's. If ya run into extreme heat then 10W 40. I would not use the 5 weight oils at all. Just personal preferance. Link to comment Share on other sites More sharing options...
Guest norb Posted May 14, 2008 Share Posted May 14, 2008 I use Quaker state 10w30 in all of my cars for over 30 years with never a problem. Maybe it,s because the Buick lab used it then. Link to comment Share on other sites More sharing options...
NTX5467 Posted May 14, 2008 Share Posted May 14, 2008 You can probably find a "virgin oil analysis" (VOA) at www.bogistheoilguy.com. There have been some favorable comments on the "goodness" of the Brad Penn oil and it does have a good bit of zddp in it (according to the VOAs). BUT no more than CI-4+ diesel oil (usually SL rated, as the Rotella T synthetic 5W-40 I can still find at WalMart. Mobil 1 also has a 5W-40 TurboDieselTruck oil, which has at least as much zddp as the RotellaT CI-4+ syn oil does.There is also a "Gearhead" brand oil made in FL for older engines. Viscosity-wise, 10W-30 or 10W-40 OR the similar 15W-40 CI-4+ diesel-rated "dino" oil would probably be fine. As would the 5W-40 CI-4+ syn oils. KEY thing is to NOT use the "CJ-rated" diesel oils which are designed for the current-production new diesels with particulate traps and have "SM" API ratings . . . with less zddp than the prior CI-4+ oils. For some reason, the RotellaT 5W-40 is priced about $1.00/qt less than the Mobil 1 products, which makes it just a little more than blended synthetic of any brand.Many choices! NTX5467 Link to comment Share on other sites More sharing options...
64BuickCat Posted May 25, 2008 Share Posted May 25, 2008 Valvoline 10W30 racing oil (ZDDP is part of the mix.). Link to comment Share on other sites More sharing options...
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