Engine oil Grade

Technical Area Routine Servicing
1
  1. My model of MX-5 is: _2016 1.5 ND SEL
  2. I’m based near: NI_
  3. I’m looking for technical help or recommendations on: Oil grade

We have a 2016 Mazda 1.5 MX5 ND and a 2017 2.0 Mazda 3 Sportnav. In recent years I have specifically insisted on Mazda Supra 0W-20 at the service for both cars.
A local Mazda dealership recently said Mazda recommend Mazda Ultra 5W-30 for the Mazda 3.
From the User manual either are recommended and rightly or wrongly I believe that the 0W-20 is preferred.
Obviously no harm in using either, but what are the advantages of one over the other?
Should I continue to insist on the more expensive Supra 0w-20 for both cars?

2

The sae rating is for hot and cold testing and how many drops of oil you measure. Don’t ask me how its done i can’t remember

For cold test its the first number and smaller is better
0w is better than 5w
5w is better than 10w

For hot test is the second number and bigger is better
30 is better than 20
40 is better than 30

Fully synthetic oil means it doesn’t degrade as easy as semi synthetic.

My recommendation is to open the manual and read whats recommended for your car and the ambient operating temperature you live.

I use mobil 1 fully synthetic 0w 40 in my cars (but thats my own choice and do it on my own risk)

Last thing… never skimp on oil or oil changes. Its what keeps your car alive

1 Like