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What are you guys using for motor oil in the 1st Gen motors? Can you run synthetic, or is that a bad idea since it is injecting oil into the carburator?
I do not think any of us are running synthetic oils,I think the last oil change I did I used Valvoline Racing Oil 10w-30. I have heard not to use syn and i have heard it does not matter since we pre-mix our gas and 2 cycle oil.
If you want 1 extra HP and want to rebuild your motor more often, use 10w30. Otherwise, go for Valvoline VR1 20w50. Watch Autozone for when it goes on sale and then buy a few cases. 1oz-1gal 2 cycle pre-mix. Valvoline has some in a blue bottle that works fine.
As to synthetic, just have a look here http://www.idemitsu-usa.com/h/40/20w50.htm. I couldn't tell a difference and since I use 8qts and change every weekend VR1 was more cost effective.
I checked last night and i use 20w-50 also. when you race 1 or 2 times a year you dont change oil that much
DO NOT use synthetic oil. 20/50 or 10/40. Also, not sure if it makes difference in oil due to elevation?
we also use Benoil mixture. Not sure if its bette than just off the shelve 2cy mix, but it smells good when its burning :)
Thanks for the info guys! Will the 20w-50 be ok when the temps drop? We have some races in the spring and fall where it is 30-40 degrees in the morning for practice/qualifying!
As long as you let the oil get up to temp before going out on track and make sure it stays at operating temp. Might need to experiment with taping off some of the radiator and/or oil cooler. Recommended temps can be found here: http://www.mazdaspeeddevelopment.com/pdfs/catalog/techtips.pdf
The synthetic oil debate comes from the OMP. If you are using the OMP then you should use regular oil, if you have disabled the OMP then synthetic is fine.
Thanks again for all the info guys! I ended up going with the Valvaline VR1 20w-50 I still have the OMP connected, so that seemed to be the best option. I had a leak at the oil pan gasket, so I dropped that down, repainted it and put it back up this weekend. Now all I need are new harnesses and I will be ready for tech inspection. I am hoping to do my first race at the end of July (The next spec7 regional race up here)