Rotella T6 5w-40
But if you want the short of it:
ANY high mileage full synthetic 5w-30 oil will do great. Mobil 1? Sure. Amazon Basics? Hell yeah. Wal-Mart's Supertech? Send it.
I dropped some 0W-30 Mobil 1 this winter, and my sol with a d15b7 loved it. Made cold starts very smooth, and noticed no reasons not to continue running it.
I've used only 5w30 full synthetic (usually Mobil 1, sometimes others) since I bought mine 15 years ago (D15B7). Using the high-mileage variety nowadays, supposed to help out the old seals etc. Just over 150k miles but engine runs very smooth so seems to be doing the trick.
I use Mobil 1 synthetic blend HIGH MILAGE 5w-30. I think the high milage formula is the best for these old engines.
For instance, i use 5w40 she'll helix ultra, and it is thin 5w40 and it has ll01.
Whatever full synthetic is on sale, last time it was Rotella T6 15w40, every 5k.
I run t6 15-40 in my 07 lbz with the cat oil filter adapter.
I’ve been using t6 with pretty good lab analysis but I’ve been considering switching over to amsoil.
Since getting my tune I run Rotella T6 5w-40
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