Originally Posted by jimbrewer
Originally Posted by bbhero
My dumb donkey self forgot to mention all the oils I have run it the car...all 5w30 except a run of 0w30 Castrol Edge and a occasional run of a 10w30 like Havoline Pro DS or Mobil Super Synthetic...
Pennzoil Ultra
Castrol gold bottle
Pennzoil Gold
Castrol Magnatec
Castrol Ultraclean
Valvoline Maxlife full synthetic
Valvoline White bottle
Valvoline Maxlife
Havoline Pro DS
Havoline DS
Havoline high mileage
Mobil Super
Mobil Super Synthetic
Carquest full synthetic
Cam2 Dexos1 Gen 2 full synthetic
Cam2 SuperproMax
Lubrigold
Warren Oil
Federated Auto parts full synthetic
Motorcraft
Quaker State ultimate durability
Quaker State high mileage
Castrol Edge 0w30
Royal Purple
Formula Shell
Peak high mileage
Peak full synthetic
Typical BITOG maintenance history. Never use the same oil twice.
I think you've hit on something. The different brands use different detergent formulas. What the first oil leaves behind, the second oil takes away. Or maybe the eighth oil.
A lot of us actually use the same oil.
My Tacoma in my sig has never had anything but Mobil 1 (I've only varied the particular flavor of M1 a few times; used vanilla M1 for a while, then the old M1 Truck & SUV for a while, then, at about 75,000 miles, I switched to M1-EP, and have stayed with that variety ever since. Only thing I've varied with that is occasionally using the 10W-30 instead of 5W-30 sometimes.
But, I've wondered about the theory you mention. Wondering if it might actually be better for the engine to vary it up.
These days, I'm certainly not opposed to using different oils. Definitely not married to M1; when I had my 2016 WRX, I used PPPP 10W-30 exclusively.
I know that M1-EP is a very good oil, with a significant % of PAO. Am I convinced that it's the best for the money? No. In fact, lately I've been intrigued by many of Gokhan's posts about viscosity modifiers, and certain oils that are able to meet multigrade specs while using VERY little VM - for example, Valvoline Advanced and PPPP come to mind. Certain Amsoil, also.