That is fluid/fluid heat exchanger.No, in a lot of scenarios the oil is colder than the coolant and the coolant is maintaining the oil temperature.
For example the engine my my Vauxhall Insignia, when cruising follows the coolant temperature almost to within 0.5°c.
Only when I really start to load the engine up (90mph up long hills, towing a caravan or generally hooning about) does the oil temp start to surpass the coolant temp.
Do most engines measure the oil temperature at the sump? I must say I've never seen a sensor on the sump.
Finns are just one of the tricks in the sleeve. But when you are hovering at such high temperatures like this VW radiator type is the only way to go.There's several ways to increase cooling capacity of engines. Performance engines often also have finned sumps, and larger oil capacity which increases the dwell time in the sump.
I tow a 1500kg caravan with a tiny 1.5 litre 3 cylinder 122hp diesel engine in a Vauxhall Inisgnia.
On motorways I tow at 60mph. 6th gear when towing is an absolute no-go. So I have two real choices, 5th gear ~2000pm or 4th gear ~2500rpm. 5th sometimes struggles with inclines which means I have to drop into 4th anyway. So now I just leave it in 4th gear with cruise control set to 60mph and let it chug along.
What's interesting is my oil temperatures and EGT's are significantly less in 4th gear at 2500rpm than 5th at 2000rpm.
I see oil temperatures of 130-140°c on long inclines. It very quickly cools and drops to ~100°c once the road flattens out.
You increase the film thickness or MOFT which prevents wear. Except a tiny fuel economy difference there is no disadvantage to an oil with a somewhat higher HT/HS.When making the original post I was hoping that by using one grade up on the hot rating I'd be giving it a little extra film strength whilst not making the engine work excessively harder as the oil was so hot (and therefore thin).
VW504.00/507.00 are ONLY 0/5W30! VW511.00 is basically thicker version of VW504.00/507.00. So use VW511.00 with confidence in your engine. Problem with higher HTHS is more heat. It will create more resistance. But, considering your location dilute coolant concentration to 20% coolant, 80% distilled water. Or do it to -10c. That will allow better heat dissipation.VW appear list VW 507 00 for this vehicle, however I can't seem to find a 0W-40 which meet this spec!
What is your location? That detail might be important.
What's the ambient temperature and what weight are you towing?
What location? Your oil temps of 130 - 140°C usually mean coolant temps
like 120°C or above. That's when the ECU definitely reduces power.
Still no answer.
It doesn’t matter. Even though the approval lists acceptable grades the technical requirement is for a minimum HT/HS. That makes the grade irrelevant. Just buy an oil with the proper approval. The bigger reason you won’t find a 0W-40 with VW 507 00 approval is different.VW appear list VW 507 00 for this vehicle, however I can't seem to find a 0W-40 which meet this spec!