Age old question, 5w20 vs 5w30

[M-Sport fan]

Why MTF-3? And not MTF-2?

I was just listing/mentioning them both, since some northern tier states and Canuck province members use the thinner stuff, even year round.

 

[Volumetrik]

Why MTF-3? And not MTF-2?

I decided to run MTF-3 because we get -30c temperatures a couple of times and -20c temperatures regularly during winter here in Montréal. It's thicker than the DCTF oil ford suggests, but not as thick as MTF-2.

I've had MTF-3 in my gearbox since July 2018 without issues.

 

[M-Sport fan]

I decided to run MTF-3 because we get -30c temperatures a couple of times and -20c temperatures regularly during winter here in Montréal. It's thicker than the DCTF oil ford suggests, but not as thick as MTF-2.

I've had MTF-3 in my gearbox since July 2018 without issues.

I would do the same if I lived up near/above that parallel.

Or, I would be totally, insanely OCD, and change it twice a year, by ambient temps, between the two weight MTFs.