when i run my truck on longer trips that i normally run the truck in the higher mph range, say 60-80, i notice that towards the end of the run the oil pressure seems to drop slightly, as if the oil is heating up and thinning out from the use...is this normal? and if possible, could i run a heavier weight oil to maybe prevent this or keep it from thinning out quite so bad...i never drop below the safe level of oil pressure it just worries me that some day it will, or that the oil will get so thin that something will go wrong...ive read warnings before about running heavier oils that could damage the engine in certain regions because of the climate and temperature keeping the oil from heating up enough to reach the right viscosity...but i am on the Mississippi Gulf Coast so our heat is soaring down here as it does nearly year round...our climate is not one prone to cold weather that would really affect oil viscosity...just need some input from board members with more experience than me on this one...thanks yall...

 

well, what are you using now?

 

I run 20W-50, have for a long time.

 

I run 15w40 now, with no problems, but I think I may bump it up to 20w50 just because I've got an ole worn engine.

 

I've been running 20w-50 for years (Castrol Syntec) and it's worked for me. I can't IMAGINE running an even THICKER oil! Do you hvae any oil use?

 

I used to run 20w-50 but these days I have been buying into the hype and running 10w-40 9 months out of the year and 10w-30 during the coldest winter months.

If I suspected a reason to run heavier oil I wouldn't hesitate to go back to 20w-50 though.

However if I did want to go heavier I would probably try running Mobil 1 15w-50 synthetic. That's good stuff.

 

15w40 is a good summer oil around these parts, i've been running 10w30 with good results for mileage reasons(thinner oil has less drag).

a thick oil like 20w50 won't hurt anything, just maybe give you a little worse mileage. the 20R and 22R originally called for a 20w40 oil back in the 80s.

 

im currently running just the toyota specified 10w-30, and have since i got the truck...but i do notice a little bit of oil usage, maybe a quart between oil changes, this is more noticable when i make lots of those high mileage trips on the highway and interstates...i was thinking about going to 20w-50...

 

when you run on the highway it burns off all the blowby gasses from the oil, and looks like its using more oil.

 

I run 10W-40 during the summer/spring/fall, and 10W-30 in the winter. haven't had any problems other than the fact that I need to get my oil pan gasket replaced (arg. PITA).

I use Valvoline Synthetic blend, btw.

 

If you want to learn everything about oil, go to http://www.bobistheoilguy.com/

 

I run Valvoline 10w40 in my wife's stock 87 Runner and Mobil 1 Synthetic 15w50 in my 85. I've run the 10w40 in all my stock 22REs over the years with no problems at all. I hadn't thought of running the 20w50 or 15w50 since this one is only for the street, but I don't see what it would hurt during the summer. I think it'd be too thick for the winter though. I know that my 85 didn't like starting at 13k feet after being parked overnight with the 20w50 dino oil, but the 15w50 synthetic sure is nice.