What grade of motor oil does my 2002 Chevy use

Because revving the motor makes the oil pump spin faster and therefore increases pressure. It should be stable and within specs when you are at cruising speed.

Drive as is will cost a lot to fix this problem, keep eye on it.

Harold, According to the 2002 Ford Focus Owner manual,
With engine oil filter change : 2.0 liter SPI engine takes ( 3.78 liters / 4.0 U.S. quarts of 5W-20 )
2.0 liter Zetec engine takes ( 4.25 liters / 4.5 U.S. quarts of 5W-20 )
links below talk more about what they think oil should be used.
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Thread: which engine oil for BA DOHC motor? - Ford Australia Forums

www.fordaustraliaforums.com > ... > B Series Mechanical

Aug 29, 2007 - 14 posts - ‎10 authors
what oils are you guys using for your BA 6 cylinders? ... (I am only on 75000 km, so will stick to the Ford recommended 10W-30 for the time being) ... F250 cab , BA2 XR6Turbo engine , dash and firewall , GU Nissan Patrol ...

Best 15W-40 Engine Oil - Topic

forums.noria.com/eve/forums/a/tpc/f/616604995/m/361101242

The oil pickup tube has a gauze. Have you checked that for blockage?

Oil change recommended is every 3,000miles / 5000km for local short running around. If you clock up the miles quickly then extend the oil changes to 6,000miles /10,000km
Oil filter is every second oil change.
Use reputable multi grade oil 15W/40 or similar, Do not use standard SAE 30 single grade oil. You do not need to use synthetic / semi-synthetic oils either.

5w20 or 5w30 penzoil or better grade. Mobile is preffered.

Look on the oil fill cap. Write down what it says then call around to find out who has this class of oil.You might even call the Chevy dealer and ask for the service manager, ask him .I like the Castrol Syntec 10w-30 for my 2001 Chevy Monte Carlo.

the owners manual calls for either 5W-30W or 10W-30W, in summer or warm climates use 10W-30W, any major brand will do.