When I use M1 10/30 oil I get a lot more engine (98 LS1) valve type noises plus there is a lot of residue on the magnetic tip of the oil plug.
This last oil change I went with MaxLife 10/40 and there were no abnormal engine noises and very little residue on the magnetic tip of the oil plug.
Well I decide to try Mobil1 again (the new formula). I knew the 10/30 was not going to work without mixing it with some 15/50. So this is how I determined the amount to mix in order to get a viscosity similar to the Max Life 10/40.
Using the viscosity Kinematic, cSt @ 100°C listed below I determined that mixing 3.5qts of 10/30 with 2.5qts of 15/50 would yield a viscosity Kinematic, cSt @ 100°C of ~13 and
2.5qts of 10/30 mixed with 3.5qts of 15/50 would be ~14.2.
I added the viscosity Kinematic of each oil in the amounts listed above and divided by the total amount of oil mixed (6qts). I averaged them together.
Is this a correct way calculate viscosity when mixing oil?
Kinematic, cSt @ 100°C
Mobil1 10/30 = 9.8
Mobil1 15/50 = 17.4
Max Life 10/40 = ~14
Total capacity of the engine = 6qts
The above is being used in a 98 Z28 with the LS1 engine. 37k miles
Thanks
John
This last oil change I went with MaxLife 10/40 and there were no abnormal engine noises and very little residue on the magnetic tip of the oil plug.
Well I decide to try Mobil1 again (the new formula). I knew the 10/30 was not going to work without mixing it with some 15/50. So this is how I determined the amount to mix in order to get a viscosity similar to the Max Life 10/40.
Using the viscosity Kinematic, cSt @ 100°C listed below I determined that mixing 3.5qts of 10/30 with 2.5qts of 15/50 would yield a viscosity Kinematic, cSt @ 100°C of ~13 and
2.5qts of 10/30 mixed with 3.5qts of 15/50 would be ~14.2.
I added the viscosity Kinematic of each oil in the amounts listed above and divided by the total amount of oil mixed (6qts). I averaged them together.
Is this a correct way calculate viscosity when mixing oil?
Kinematic, cSt @ 100°C
Mobil1 10/30 = 9.8
Mobil1 15/50 = 17.4
Max Life 10/40 = ~14
Total capacity of the engine = 6qts
The above is being used in a 98 Z28 with the LS1 engine. 37k miles
Thanks
John