Synthetic oil change interval?

[Ross]

According to 632regals poll roughly 70% of us use synthetic oil.
I'm interested in the change intervals you all are using.
I've just made the switch to Mobil1 10/30. Engine is currently dry, I'll be watching for leaks and if they sprout like the last time I used the stuff it's back to dino.
Meanwhile, how long do you guys run it?

[632 Regal]

i go ~5k between. I also use the thicker 0w-40... scour the local stores til I get like 9-10 qts for the next interval (the V8 takes 8 qts)

[Ross]

Thanks. Scour the stores is right, I wanted 10/40 but settled for 10/30.

[swenpro]

i go ~5k between. I also use the thicker 0w-40... scour the local stores til I get like 9-10 qts for the next interval (the V8 takes 8 qts)

0w-40 is thicker than...... ? I was under the impression that zero weight meant a thinner oil.

[BMWCCA1]

Low number is what it can break down to eventually, not necessarily what it runs at even cold start temps. I believe Mobil took the 15-50 and stuck a new high-mileage label on it so they could charge a buck or so more for it recently. That's what I was using. Guess now I'll have to go with 5-40 which is what the previous owner used in my current car.

[Bill R.]

mobil 10w30. 0w40 is thicker than 10w30 at the temperatures that you use it at. This has been explained many times before. A 0w40 is a 0 weight at cold temperatures for quick oil flow to the bearings when first started. But it is a 40 weight when it reaches the normal operating temperatures for the engine oil temp which is close to 100C or 212F. The 10w30 is slightly thinner at operating temps and pours a little slower at low temps than the 0w40 does.

0w-40 is thicker than...... ? I was under the impression that zero weight meant a thinner oil.

[califblue]

5K here, I use Royal Purple 20/50

[Fetch]

i go ~5k between. I also use the thicker 0w-40... scour the local stores til I get like 9-10 qts for the next interval (the V8 takes 8 qts)

Sorry, don't mean to hijack, but...
Jeff, I'm still trying to understand lifters,
I'm in the midwest btw,
Thinner or thicker oil is better for lifter functioning (especially mine w/150k on them)?

do you understand what I'm asking lol?

Is the 0w40 a good choice for the M60 & its lifters, etc?
Would the 0w40 be good year round because of it's thin cold weight?

end hijack

[632 Regal]

my engine seems to like the 0w-40 and I have a couple miles on it too. The thinner helps at startup, it fills the lifters faster and at temp its thicker so that it protects and has less leakdown than say a 30wt oil

hope that helps some

edit: yes it's a great choice year round.

Is the 0w40 a good choice for the M60 & its lifters, etc?
Would the 0w40 be good year round because of it's thin cold weight?

[Boone.Msi]

i changed from synthetic castrol 10w40 to synthetic mobil1 0w40 and my car runs twice as good as it did before i did the oil change. seems like better throttle response, tighter shiftpoints, etc. although it could just be from changing the dirty air filter.

seems like it starts smoother in the cold also. Im stayin with 0w40 from now on.