Mixing motor oils

*clyde* · 08-01-2018, 12:49 PM

Quote:

Originally Posted by FC

I have a leftover quart of the unobtanium Castrol OE oil. The last oil change, I filled with only Mobil1 EP.

For the next oil change, can I use up that quart and fill the rest with Mobil1 EP? They are the same 5W-20 weight.

Sell the unobtanium on ebay to pay for a full pan of Mobil 1 EP? If not, mix and match and don't worry.

FC · 08-01-2018, 01:26 PM

Quote:

Originally Posted by clyde

Sell the unobtanium on ebay to pay for a full pan of Mobil 1 EP? If not, mix and match and don't worry.

Thanks! I thought it would be ok. SUV takes 8 quarts (5.0L V8)

I've considered the ebay route, bu tit is probably more trouble than it is worth.

Alan · 08-01-2018, 03:56 PM

Isn't oil mixed when adding a quart ? I know when my cars are low and I add a quart I go to the local gas station (usually Mobil) and get a quart that meets the requirements of the manufacturer. I have no idea what type & weight of oil the dealer is putting in my cars

08-01-2018, 03:56 PM	#3
Alan Carmudgeon Join Date: Apr 2005 Posts: 4,681	Isn't oil mixed when adding a quart ? I know when my cars are low and I add a quart I go to the local gas station (usually Mobil) and get a quart that meets the requirements of the manufacturer. I have no idea what type & weight of oil the dealer is putting in my cars