Posted by sotxbill on July 21, 2016 at 08:11:26 from (104.5.24.112):
In Reply to: synthetic oil posted by nhbalerman on July 20, 2016 at 18:55:26:
NO... virtually all diesel oil is now down to low moly and zinc.. because... the chemicals are attracted to very hot surfaces,, and will coat them .. this will render the catalyst systems useless. so all new diesel oils are NOW running lowered amounts just like the GAS versions. HOWEVER... Diesel oils still have the high bases additives to fight acids, and other additives to handle soot.. that gas engines dont need.. so there is STILL a big difference..
And there are many many simi synthetic oils and fully synthetic oils out there. any time you run a 15w-40 oil it usually is a group 3 synthetic blend... a 5w40 has much more synthetic, but may not be 100 % synthetic, as they will blend it to the amount needed to get the performance needed..
As to making engines use oil... yes... if the seals are already worn out... the hd oils will remove sludge deposits and slowly clean the engine. AND if the seals are worn out, hard, and cracked... removing the sludge coating will expose the seals.. and the rest is history. IF the seals are good, running an hd oil will NOT make it burn oil,, Infact it can actually clean the rings and ring landings and make it run better by increasing the compression by freeing up the rings... So.. your experience will vary based on what the engine has used and how it was treated.
Cheap oil will thicken and turn to sludge.. the thinner part will boil off and vaporize,, the heavy waxes and parrifins will settle out to sludge. The longer you use it, the thicker it will get. Also the complex molecues will shear or separate and break down.... simi synthetic oils DO NOT do this.. the rest is the additive package .
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