Mixing conventional oil with synthetic?

BK911 · BK911's Garage

Hopefully this weekend I am installing a 3.0 into my 73. I've been using conventional oil with the 2.4, but the 3.0 has been using synthetic. I plan to contunue using synthetic. My oil lines are currently filled with conventional. Will this 'dilution' have any effects I should be worried about? Should I drain the oil cooler and lines?

Thanks,
BK

Zeke · 12-19-2006, 12:49 PM

Which synthetic? Most are a blend anyway. IMHO, it will be fine.

masraum · 12-19-2006, 01:36 PM

No, not a problem. Hell, several of the oil companies sell "blends". I think Milt is talking about the fact that several of the supposedly fully synth oils are high grade highly refined base dino oil with additives.

BK911 · BK911's Garage

Nice, thanks gentlemen.

Not sure which one I am going to use, probably whichever is on sale!

masraum · 12-19-2006, 03:11 PM

Mobil 1 has a good rep, although I've heard that it's not what it once was.

Here's some info from a synthetic oil thread

Quote:

What exactly constitutes synthetic oil is a debatable subject... I personally stopped using M1 years ago when they abandoned using 100% polyalphaolefin (they now use mostly Group 3 ultra refined dino oil with a little polyalphaolefin thrown in). If 100% polyalphaolefin is what you want, I think only Redline, Amsoil, and Motul still sell it these days.