I usually use Valvoline for my tractors but the letter series need a bit thicker oil that Valvoline carries. My 300 and dad"s 300U I use 10W-30 all year long and have plenty of oil pressure. But the A and B when warm will have little oil pressure at idle so I want to use 15W-40. At Wally World could not find Valvoline at that grade but did find Supertech. I was trying to compare the ratings but it may as well have been in Chinese. I figure it has to be as good or better than what the tractors have ran on when they were new so I went for it. So my questions are:
1. Can someone make sense of the specs. ratings for me (CJ-4 and all of those)?
2. Is Supertech a decent grade oil?
3. I would like to have all tractors on the same oil to simplify things (although with only four it is not the hardest). Would it be a bad idea to but 15W-40 in all the tractors even the two 300s that have good oil pressure with 10W-30? The voice in the back of my head says to just use the two different types of oil and play it safe.
Thanks
1. Can someone make sense of the specs. ratings for me (CJ-4 and all of those)?
2. Is Supertech a decent grade oil?
3. I would like to have all tractors on the same oil to simplify things (although with only four it is not the hardest). Would it be a bad idea to but 15W-40 in all the tractors even the two 300s that have good oil pressure with 10W-30? The voice in the back of my head says to just use the two different types of oil and play it safe.
Thanks