Yeah, there's no real set number to do it. Some people change back and forth and don't have any leaks or any problems. Mine began to leak from the rear main seal on both cars. It just seemed like too much of a coincedence so I change it 3-5K all the time now.

 

Don't think of your tC with 30,000 as being old - it is a new car still so changing it should not matter - the rubber seals haven't aged yet!

 

Yeah, sorry. Forgot to mention that my vehicles were around 90K when I did the swap. Sorry.

 

ok cool! thanks for the replies. I'll probably perform the change some time soon.

 

going Mobile 1 when i hit 1000.

 

I swtiched to Mobil 1 after my first free oil change. I should have used up the other 2 but the dealership closest to me has crappy service. I switched to Mobil 1 Fully Synthetic after 3k.

 

I may go with the royal purple oil when my 3 freebies are up. Ive heard good things. I used Mobile 1 full synth for years in my Trans Am, its good stuff to.

 

BIG controversy online over M1 "MAYBE" being a Group III and not 100% synthetic/synthetic basestock.

Doesn't mean M1 isn't still a great oil, or that I will change, but it will be interesting to see what happens with this.

In the oil world, this is becoming a big one - more to come...

Scott

 

I have a little over 6k on Synlube reaching 10k before the end of the month and it still seems to be working great. If you really want to change . . . change all the way and get away from the dino drippings altogether . . . and almost forget about changing it again too . . . well as least for 150k or 15 years whichever comes first.

 

The only problem I see in leaving oil in for longer intervals would be, not necessarily the oil itself breaking down, but the filter not filtering anything out after a while. The longer you keep the filter/oil in, the more "left overs" begin to form within your engine due to slight burn off, dust from air intakes leading into valve cover, overall viscosity breakdown....ect. B/c you can't change the filter without losing a good bit of oil, have you ever had any problem with filter bypass or complete filter failure?

Just a question.

 

Yeah the filter is a lot bigger than the stock filter and is a 5-8 micron synthetic filter element and has added Neo magnets on the outside to retain metal particles. The filter actually gets changed at 36k and 75k with the initial 36k change removing the last of the dino original oil which will have broken down and gotten trapped in it by then. I did drain the engine over night and then jacked up the left side of my xB to get the last bit out of the oil pan. There was quite a bit in there until I jacked it up - maybe half a cup. When I do change the filter I plan on draining it pretty well and then saving the lube that comes out of it. Will let you know in about 3 years!! OMG it does take some time to get used to the idea that I don't have to change the oil for such a long time. BTW it ends up costing about HALF of conventional oil in the long run AND you get better gas mileage which saves even more money. Plus all that time changing the oil and getting rid of the old oil which is pretty toxic.

 

Yeah, I've been taught and still do the changes for conventional around 3K and synthetic around 5K so I'll stick to that.

Good luck with your car and keep us updated on any work needed or whatever due to oil problems. (not saying there will be any) Just trying to get different views of what can happen depending on different oil change intervals.

 

It is a proven product - the formulation has not changed since 1992 and other Synlube products are used on the Moon and Mars rovers. If you check out the Synlube.com site there is a long explaination on what happens to oil and why it breaks down. The one thing that is weird is that the stuff is black and it stays black but it makes it easy to check the level on the dip stick. Oh and you don't want to have any leaks $$$ - my biggest fear is bringing the xB in for some other non-oil related service and they drain it out ARGGGG!!! Need to weld the drain plug in or something.

 

hahaha

 

Synlube is still working great past 10,000 miles and closing in on 11,000 miles - have some long trips this summer planned so I should be racking up more miles. It is amazing how quiet the engine is at idle you can barely hear it running and the gas mileage has pretty much leveled off at about 42-43mpg average per tank.