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#1129283 Tue Oct 13 2015 03:04 PM
Joined: Dec 2008
Posts: 1,094
Any harm in mixing multi grade oils when doing a oil change? Example 3qts. of 20/50 mixed with 2qts. of 5/30. Just trying to use up what I have laying around in the garage.

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55shaker #1129285 Tue Oct 13 2015 03:12 PM
Joined: Feb 2004
Posts: 24,750
Kettle Custodian (pot stirrer)
I've done it often with no difficulty, but if you're putting 5-30 in a stovebolt engine, I'd question the wisdom of doing that. Stovebolts don't like water-thin oil.

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55shaker #1129367 Wed Oct 14 2015 01:09 AM
Joined: Oct 2006
Posts: 11,770
I'd agree with Jerry also Brian. I've been running Rotella-T
15W 40 in my engine from the get go. Even used it for the break
in after a complete engine shop engine rebuild. I carry 15lbs
on the road and about 6-7lbs at idle.
As many opinions on oil as there are people that use it.


55shaker #1129453 Wed Oct 14 2015 02:09 PM
Joined: Aug 2012
Posts: 1,743
Shop Shark
I've been running 15w40 in my 49 216 since I got it running again (approx. 15k miles ago) and it avg's 12/13 psi cold at speed and around 7/8 psi warmed up at speed. Idle is around psi 5 or so.
That's warm weather pressures.
With colder weather it'll register 15 psi cold but will still settle don to around 7/8 psi when warmed up, just takes longer to warm up.

re. mixing oil. I mix in 20w50 (when I find it on sale)over the summer and get a psi or two higher but stay w/15w40 over the winter. My 216 leaks out just about every sealed orifice when running so I mix oils on the fly (always Rotella T) and theres no telling what the actual "weight" is grin (it's some combination of 15w40/20w50) The 216 likes whatever the concoction is and so far hasn't let me down.

Ditto on Jerry and Denny

Moderated by  Phak1, Woogeroo 

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