Mixing Synthetic Oil? Plz advise.

[iDs748]

It has been 1335 KM since my last oil change, 848 miles and my oil level is not close to full.

I did the oil change with castrol syntec 5w30 synthetic. I don't wanan pay the $9/quart for a bottle here in canada. I have an extra quart of mobil 1 5w30 synthetic which I have not opened as it was a 4.4L jug with free bonus 946 mL/ 1quart bottle.

Is it safe to just top of existing syntec in engine with the mobil 1 5w30?

Yes I have an oil consumption issue and 3 bottles of Auto-Rx are apparently on the way.

 

[ElDiablo]

I have to ask. Why are you using synthetic oil if you're consuming that much?

 

[Pablo]

It probably won't hurt to mix the M1 for couple thousand, but why not just get some more Castrol? (or are you saying Syntec is $9/qt - ouch!!!) So - just get some dino Castrol it'll mix ok.

 

[Turk]

Is it safe? Sure!

How many miles or Km on the engine? If it's higher mileage, you may want to try a Maxlife or something similar...

 

[wwwKJJEEPcom]

What does "not close to full mean"? Is it just not touching the full mark or is it a full quart low? If you are going to add Autorx anyway...just use the M1.

 

[iDs748]

high mileage for sure 169 985 KM.

I made a switch to synthetic about 6000KM when i started doing my own oil changes. I stopped getting it done at shops because of frustration from them not letting it drain right.

It use to consume with dino too.

Anyways I do have some castrol gtx 5w30 in the garage? I can mix that with syntec no prob?

What is better mixing mobil 1 synthetic or GTX 5w30 dino.........and yes $9/quart canada is expensive for everything.

 

[jmac]

I would prefer to mix with the GTX rather than the M1 for personal preference. I feel it is slightly safer to mix a dino and syn esp. from same company than two syns together from different companies.
Not that I buy into the whole additive clash thing to the extent that some do, but M1 definately uses a different additive package than most.

 

[wgtoys]

Years ago I topped of the Syntec in my Volvo with some Mobil-1 I had sitting around and happened to get a UOA on it later. The results were stellar. Go ahead and top off with the GTX or Mobil-1, it isn't going to hurt anything.

With your car's age and oil consumption I wouldn't bother with synthetic in the summer. For Canadian winter use a synthetic will always be a good idea just to make starting easier on the car. Valvoline Maxlife regular in the summer and Maxlife Synthetic in the winter would be my choice to minimize oil consumption.

 

[Merkava_4]

What type of vehicle and mileage? You might be better off just going up in viscosity to control the oil consumption. Mobil 1 makes some good high mileage oils that are just for that purpose.

 

[iDs748]

Good suggestions guys. I added some castrol gtx 5w30 man i really have an oil consumption issue.

I'm just waiting for the auto-rx to show up so i can start the
process.

 

[Seth]

Quote:

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canada is expensive for everything.

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Amen brother!! Time to move south...