Has anyone ever...
 

has any one ever experienced a 30* increase in oil temp and excessive blow by when switching from synthetic to regular motor oil? Water temp remained the same. Am I just burning off the remains of the synthetic???
Thanks
Dan

I would buy the temps going up a bit. The blow by seems odd... Isnt non synthetic oil ussually less likely to do that?

Jon

what oils are we talking about??

switched from Royal Purple racing 40 to Valvoline 50 wt racing

Dan,
I went the other way..from Valvoline 20-50 to the Royal Purple.. didnt see any changes that I can relate. I see oil temps from the pan around 260/270 when running hard..

Dick

WHY...go back...unless u change it a lot more often due to price??? the Val **** has a lot more zink content for metal to metal.

I switched for several reasons...not available..breaking in new distrib gear..temps were too low.. never got hotter then 200 even when running hard..mostly 150 or so.
Now temp is 230 at 3500-4 rpm
pressure is good
water 150-160.
Also timing was way advanced which would cause hotter temps???? Also may have over filled it...12 qt pan..I put in 12 qts..usually run 10
Backed it down to 35* after a short run. Power is still good. What conserns me is the blow by

actually retarding the timing can account for higher tmps. and merc runs 190 deg for oil..

Well
It was the oil I guess
Re placed the Valv with more Royal Purple and all is right with the world again. I cant figure this one out...but who cares???

Thanks for the input fellas
Dan

I too used Valvoline once and had major oil consuption...switched back and all was fine.

So if conditions were tha same with both oils what was the reason for temperature differance. Less friction or able to disipate heat quicker or ? Just got me to thinking. If is from less friction wonder how much HP this would =? Glad all is back to normal.

I never have really tried synthetics because of cost and you change the oil so often. I have not had any oil related trouble with dino oil either. But threads like this one start me thinking maybe I should.

I just switched on a break in engine from Pennzoil HD 40 to Valvoline 20W50 Racing and saw a 40 degree oil temp drop at WOT. So much for my theory on oils. I also change every 10 hrs.

I've used Valvoline 20-50 Racing and had never had an oil consumption problem.......except when I had that hole in the piston!!:D

I knew a guy that added slick 50 to his engine and saw an increase in oil consumption. We concluded that the marginal oil ring wasn't able to scrape the slicker oil off the cylinder wall. Never knew if the consumption went back down.

Hey Blown,

They make an additive guaranteed to stop up those pesky piston holes! Just pour a can of Play-Dough in there.