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I used 5-30 Valvoline Full syn in my car, and I drive about 1500 - 2000 miles/year. Which way should I use? Time or Miles for oil change ?

Just bought a Digital tire pressure gauge(EIS162), Very disappoint. Checking one tire and the reading varies from 27 psi to 30 psi , I really have no idea what is the real pressure of the tire. Any recommendation about digital tire pressure gauge brand ? Thanks

My 2004 Saturn Vue 3.5 L hits 100K miles last week. The owner manual calls for spark plugs replacement. I removed one in the front this morning. The OEM is Denso iridium with platinum ground pad and it looks perfect, the gap remains the original gap (040). Shall I replace the spark plugs even I...

If I mix 2qt of PP 5w20 with 2qt of PP 5w-30 will I have 4 qt of 5w-25 ????

Hello I have plenty of 5W20 Penzoil on sale from Home Depot which I bought for my Honda. Shall I use it on my new Nissan Altima ? It called for 5W30 in the manual. Thanks

Hello Some one please tell me how often we should replace the thermostat. I really do not want to see the engine overheat due to the closed thermostat. I think to invest few more dollars to a "good" thermostat is a good investment.

The price between these 2 types are very much the same at Walmart (couple cents more for Super Tech). Which one is better for the car??? Full syn in supertech or semi-syn in Motorcraft ???

Hello I am a new bee, glad to join the forum. Have been learned a lot about "everything" on this forum. I have 3 questions. 1. In the "oil bible" which I get it from an other oil forum, the author recommended to use 0-30 or 5-30 instead of 5-20 for new Honda and Ford engines. However, based...