Quote:
Originally Posted by NOTASIX
Synthetics are not created equally.. Some have bad properties of dissipating heat, but they generally operate better at higher than conventional temps.
I'd say if you are having better results with a 5-30 oil than a 20/50 that your running clearances are tight, maybe a little too tight.
|
The synthetic was running cooler at 217 than the rd 20 50 running at 240.
Here's my question to Amsoil and their response below it.
Question:
Hi, I recently had my 75 Porsche 914 aircooled 2.0 liter engine rebuilt and have about 1000 miles on it. I first put in 20 50 regular oil for the first 500 miles so that my rings and bearings would seal and seat. The engine is running smooth and no oil leaks, but the engine temp is running at 240 degrees. I next put in Mobil 1 synthetic 5 30. The engine temp ran about 217 degrees which is ok but i wanted it to run cooler around 190-200 degrees.The engine was bored out to 103mm to a 2.7 liter size and has 78mm stroke. (stock is 71) I also replaced the fuel injection system to a SDS 4E and there is a mild cam in there. I would like your thoughts about using your (TSO) Series 2000 Synthetic 0W-30 Motor Oil in the next 100 miles. Is there another weight I should consider or will the 0W-30 be acceptable? Let me know if you have any questions so you can advise and I'll do my best to answer them. I'm not a mechanic but do understand a few things. Thanks Eddie
It is normal for an oil that is too thick to run at hotter temperatures as the thick oil makes the oil pump work harder, creating heat and the thicker oil does not transfer the heat as well. I think you will be pleased if you change to AMSOI< 0W30 oil, but do not try to keep the oil temp under 200-210 degrees as this will allow moisture to accumulate in the oil and contaminate it. (Above 200 or so, it boils off.)
Thank you for this opportunity to respond to your question(s). As always, please feel free to contact us again if we can be of further assistance.
Valve clearance?