RalphVa
Super Member
- Joined
- Dec 19, 2003
- Messages
- 7,885
- Location
- Charlottesville, VA, USA
- Tractor
- JD 2025R, previously Gravely 5650 & JD 4010 & JD 1025R
My New Holland TC33D has a diesel engine. When changing the engine oil do I have to put in a specific oil for diesels or is it ok to use an regular oil that I put in my gas engine car like a Quaker State or Pennzoil? The owner's manual does not specify. It just says it should be 10w-30 oil for all year round.
Main (may be the only difference) between diesel oil and gasoline oil is more/different detergent to keep the additional soot from diesel engine piston ring blowby in solution. You could run a gas engine oil but change it sooner. For instance, most diesel engine oiled will go for 200 hours. If you use a gas engine oil, you should change maybe 1/2 that: 100 hours, certainly within a year's time.
A 10w30 oil is probably nothing more than the old fashioned 30w oil. You need more protection for your engine at startup. A 5w30 or 0w30 would allow the oil pump to get suction much quicker than using a 10w30. An engine starting up at 1,800 rpm would run the pistons up and down 30 times for each second, and the valve train will rotate about that many times with each valve going up and down 30 times. A 0w30 oil would get oil moving to even the valve train probably within about a 1/2 second even at -40 C/F. Anything heavier would not get the oil up there right away. I've seen this in tests our research labs showed with a transparent valve cover using various oils.
I'm currently using VW's Castrol 5w30 speced for its diesel engines (the 2010ish ones; they have about 4) for both my diesel engines after using it through six 10k mile oil changes in our VW TDI. However, I've found Mobil 1 makes an ESP (exhaust system protection) diesel oil with 0w30. May order it for the next oil changes on both, as VW doesn't offer low prices generally and sold only by litre/quart.
Ralph