I'm sure this has been asked before but I run full mobil 1 regular full syn in my 08 Explorer V6 and my 08 Fusion I4. I changed the car at 7500 miles on an oil change and the oil was dark but not black which is acceptible to me. Now the explorer has 5000 on the current oil change. should i change the oil because of more wear and tear because of being the bigger vehicle moving around or do you think I will still be ok going to 7500 miles? thanks in advance on the input.

 

If you drive mostly city, I would change it. But if there is a good mixture of city/highway then 7500 is no problem at all.

Size of the vehicle doesn't have an effect on wear, it's about the engine/running condition, etc.

 

well me any motor any car i always change oil at 5k for the first 2 years of the vehicle then 3k after that

 

Seeing as how these are new vehicles, that are likely under warranty, follow the specified OCI, with the specified service grade & viscosity lube & if your doing the work yourself, log & sign the dates into the service manual & keep the reciepts for oil & filter purchases, in case of warranty claims.

I wouldn't do "extended" OCI's while under warranty, but if you do, then also opt for a UOA for the record.

 

I am not sure, but think thr fusion is recommended every 7,500 miles.... Iwould follow that as a guide.
And congrats on using M1 oil, its great stuff.

Are you using 5w30 ?