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slivia-junkie
03-10-2005, 08:18 PM
has any one here heard of 7w30 oil? i was on a austrialian site and the guys were all talking about 7w30 oil for the sr20 engine (they get stock lucky bastards). if any one has heard of it is it good and if so is it possible to get in the states

thx
DriftingXJDM
03-10-2005, 09:59 PM
never ever...
orion::S14
03-11-2005, 10:02 AM
If you need 4 quarts in you motor...

2qts 10w30 + 2qts 5w30 = 7.5w30

So if it means that much that you have a lower viscosity than 10, but higher than 5 for cold starts...then mix the 2.

- Brian
S14DB
03-11-2005, 11:20 AM
If you need 4 quarts in you motor...

2qts 10w30 + 2qts 5w30 = 7.5w30

So if it means that much that you have a lower viscosity than 10, but higher than 5 for cold starts...then mix the 2.

- Brian
I don't think it works that way...
the head
03-11-2005, 11:24 AM
ELF and some other european oil manufacturers do make it but i have never seen it in the states
sykikchimp
03-11-2005, 01:29 PM
I don't think it works that way...

and even if it did, from what I've read about oils, it's not a good idea to mix them.
orion::S14
03-11-2005, 05:57 PM
As long as it's new oil fromt he same manufacturer (i.e. Mobil 1)...there si NO problem with mixing viscosities.

I prefer to use 10w40 for when it's warmer and I'm driving high speed events...15w50 is too thick IMO...but a 10w40 is about right. Closest I can get is Mobil 1 in 15w50 (2qts) and 10w30 (2qts).

And "S14DB"...it is that simple, and it does work like that.

See here for more: www.ls1.com/forums/archive/ (http://www.ls1.com/forums/archive/index.php/t-345725.html) (1st article I found from a quick Google search...but this is a common practice, and has no ill effects).

- Brian
S14DB
03-11-2005, 07:01 PM
As long as it's new oil fromt he same manufacturer (i.e. Mobil 1)...there si NO problem with mixing viscosities.

I prefer to use 10w40 for when it's warmer and I'm driving high speed events...15w50 is too thick IMO...but a 10w40 is about right. Closest I can get is Mobil 1 in 15w50 (2qts) and 10w30 (2qts).

And "S14DB"...it is that simple, and it does work like that.

See here for more: www.ls1.com/forums/archive/ (http://www.ls1.com/forums/archive/index.php/t-345725.html) (1st article I found from a quick Google search...but this is a common practice, and has no ill effects).

- Brian

Your math is wrong. http://www.baseoils.shellglobalsolutions.com/calculations/blending_pop.asp
http://www.infineum.com/information/viscosity.html

If you mix an 10w30 with an 5w30 you will get either a thicker 5w30 or a thinner 10w30 (there is no 7.5 grade as defined in second link). That is because the top of the 5w30 grade is the bottom of the 10w30 grade.