RECOMMENDED OIL WEIGHT on 1998 Nissan Altima

MY 98 NISSAN ALTIMA IS GETTING A replacement with a 78000 MILE ENGINE. MECHANIC IS PLANNING ON PUTTING IN 20/50 OIL VERSUS 30? my bad engine had that heavy weight because it was worn out. WHY would he make choice for such heavy weight? I LIVE IN FLORIDA AND HE CLAIMS ITS BETTER BUT?????

by in Lakeland, FL on November 05, 2010
2 answers 2 comments
ANSWER by on November 05, 2010
20W50 is too much for that engine. Even in FL 10W40 is enough for your Nissan. Use a good quality oil, like Pennzoil and replace it every 3K miles. Zee
COMMENT by on November 06, 2010
what about straight 30 or 40 versus 10W?
COMMENT by on November 06, 2010
http://wiki.answers.com/Q/What_is_the_difference_between_SAE_30_oil_and_10w30_oil Zee
ANSWER by on November 06, 2010
go with the recommened oil weight from nissan - should be 5-30 or 10-30.i would also use castrol gtx or castrol high mile oil.