Re: First time with synthetic
I agree with S2Kracka.
I wouldnt even put syntec in your girlfriends car because for the price you pay for synthetic versus regular. Put castrol GTX in that car instead, its cheaper and will work fine, although you will need to change it out every 3500 miles or so... versus 7-8 with syntec.
I dont like to go more than 4-5k on synthetic though, just my preference. Plus I usually dont drive more than 2 changes per year so I just change in spring and fall.
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