Don't yell at me. I did plenty of searching and just wanted a more recent response. I switched to mobil 1 full synthetic, with an AC delco filter(does anyone dislike AC delco?). I almost used a fram grippy filter, but threw that thing at the return cashier after reading some old posts.

Anyways, how is mobil 1 as compared to castrol or valvoline. Full syn of course.

Thanks for the reassurance.

1 more thing: will 10w-30 hurt as compared to 5 weight?

 

I've been using Mobil 1 10-30 for a long time. No problems. Haven't gotten as down and dirty as some guys, sending in the oil for analysis. Always change my oil and filter to heck with the cost.....couple of bucks for a new filter is cheap insurance. I seem to alternate between PURE 1 filters and Frams although I have used the Mobil 1 filters too (a bit expensive). I've tried the new Penzoil synthetic...don't see a real difference. Heard that Mobil 1 actually changed their formula this year. Also understand that some of the "other" synthetics have changed from "full" synthetic to a blend (Castrol??). I am staying away from them. I know that the manual says 10-30W but I really don't see a problem with using 5-30W. Seems to me that it would flow a teensy bit better. I'm ready to take some hits on that last part.

 

You will get more HP and better gas milege. As with oil filter, I only use Nissan OEM or Mobil 1. If I have to get something off the shelf at my local auto parts store. I would get Purolator or AC Delco.

 

i just switched from mobil 1 10w-30 to mobil 1 5w-30 since its freezin up here and i dont want any problems at all... in the spring i'll be back with the 10w-30... mobil 1 filters and the purolator micron filters (the blue ones seem to be very good)

 

Basically the thing to look for in oil is viscosity (how long will it retain it), flash point and pour point/temp. Most synthtics are very similar in all three with better viscosity, higher flash points and lower temp pourability (for cold weather start ups). The synthetics simply offer better protection in all three areas. If you lived in a temperate climate and changed oil every 3,000 miles anyways, synthetics would be a waste of money. I live in IA and MUST use synthetics or risk engine wear in the winter b/c is is VERY cold here. I frequently have to start car when it is -10 (w/o windchill) and merge onto the highway within a 1/4 mile! Normal oil just wont flow well if at all at those temps...