black2000xj

are there any negatives to doing this

I changed my oil about 500 miles ago, from high mileage 10w30 conventional

to 10w30 syn blend

only thing was i had a slight tick in the motor,, so i did 5 quarts of syn blend and 1 quart MMO

well the tick is gone...so im going to drain it again and go with syn blend again of course

any downfall to it....i did notice my oil pressure was lower than normal..25 psi at warm idle..

I think its b.c of the MMO making it thin....

thoughts on syn blend vs conventional?

Jeep has 127k on it...runs like a top

salad

Yeah likely the MMO thinning it out OR cleaning some crud away. Next fill run without the MMO and see what happens

belvedere

No problem switching types of oil.

tjwalker

You can switch without issue.

With only 127k (it's barely broken in!), personally I think conventional oil is just fine. I'm not a big fan of the "synthetic blend". I either run conventional (in my XJ) or synthetic (in the Vette).

I'm at 160k on my 99 4.0 and it only burns about 1/3 of a quart between oil changes every 4-5k using conventional Havoline.

black2000xj

ok, im going to stick with syn blend....jeep seems to like it a little better

as far as the oil pressure....im pretty sure its b.c of the mmo

I was just curious b.c i know the 4.0 is like a tractor motor....and i wasnt sure

i will go with that

thanks guys