in the colder weather the oil has a harder time getting circualted.



if you read any manual it will tell you in colder weather

to use a thinner oil, and in warmer weather to use a thicker oil



It even says it in the RX-7 owners manual for christs sakes, lol

yeah, I use 20w50 then switch to 10w40 in the winter (like I drive the bitch anyhow)

now Im really curious, WHO did you hear otherwise from? lol

LMAO, probably some amish guy https://www.nopistons.com/forums/pub...#>/biggrin.png



kevin.

Robs right, its obviously easy to mix up.

Yup, hotter=thicker, colder=thinner.



That's because oil thins when it gets hot. Ever try heating up cold oil in a pan. Cold oil rolls around slower, that's because it's still thick, but after it gets hot, it rolls around much easier, that's because it's thinner.



So to promote circulation, you will need thinner oil in winter because it's too hard to circulate thick oil around the engine when it's so damn cold. It will take a much longer time to get thick oil to the places it needs to be than thin oil.



With that said, 10W30 is best for winter.



I think you should use synthetic, they tend to flow much better than regular dino, and for those that think "no, no, synthetic don't burn in rotaries" that's old news. Modern synthetics burn just fine in rotaries (all burn less than 500F), and leave a much lower ash content than dino when burnt. Just don't ge the cheapies. Get quality synthetics like: Royal Purple, Amsoil, Redline, and NEO.



I personally prefer Amsoil, it's killer stuff.

https://www.nopistons.com/forums/pub...IR#>/blink.png i figured you just typed your response wrong earlier, but the other guys

confused me

What about Mobil 1?? I've always loved that stuff and always put it in my MR2. Always 12 quarts of 15-50 i believe.

True. oil gets thinker the colder it gets. If you have 20w 50 in the engine and it's cold out, you killing the engine. I would just shoot the engine with a 12 gauge, at least that way you can have some fun killing it.

If we wanted to get technical, the Workshop Manual states...



-20 - 32 degrees Farenheit= 5W-30

-10 - 90 degrees Farenheit= 10W - 30

-10 and up = 10W - 40, 10W - 50 (if it goes higher than 70 degrees)

20 and up = 20W - 40, 20W - 50



I use 20-50 personally. And is Mobil 1 considered "cheapy" oil? I love synthethic, but I hate spending 40 bucks every 3K mi, it gets a bit pricey.