I bought all new senders from hardin and the chinese **** they sent me had all my guages reading crazy this last time. Ordered real senders and all my problems went away...

Dodge truck I had. 2 different types of Chinese senders both had me thinking it was running hot. Bought a Dodge sender and temp was right back where it should be. Huge pita cause I changed heads and intake so I thought for sure I screwed something up.

I am running a 454 with a 7 qt pan. Normal cruising I see 190 for oil temps.

Extended running over 4K, temps climbs to approx 260.

Idle the last 1/8 mile into the boathouse..temp back down to 190.

I am not worried at all, using 20w50 foe a viscosity.

Ken

I would never run my oil at 260, but thats just me. If my oil did get that hot, id be investing in a bigger cooler . Just my opinion. And mercury racing's.

Yes that's awful hot, I can run Miles and miles last season and never see more then 225-230, went 5500 for at least 5 miles running last year, 260 is WAY too hot for oil temps

I think a few guys missed Dan said he is using THERMOCOUPLER Gauges not senders...

I know alot of oil companies , say how thier oils do just fine at elevated temperatures, but i dont care so much about the oil, as i do the engine.

Pac racing had a good chart showing the variances in valve spring pressures as the spring heats up. We rely on oil for lubrication as well as cooling of engine parts. I dont really want 260 degree oil spraying on my springs, etc.

Plus they dont test oils viscosity at 260. How do we know the oil meets the criteria at 260 degrees? There is no regulation on it at that temperature

Has he verified it is this hot , seemed that was the jist of the original question?

edit , is this both enggines or only one.

I am ok with 260, I would start to worry at 300, thanks for your concern and solutions.
Oil is tested for viscosity at 40C and 100C. Anything below 100C does not meet the advertised spec and anything above 100C doesn't either.

So in answer to your question, there is no criteria for any temp except 40C and 100C.

So unless you can run at exactly 100C, you are not in spec, but I am splitting hairs.

Ken

My question is if everything is reading OK w infrared gun but the guage and its 50 deg higher is not why are we assuming the guage is correct?

I must have missed something.