Which Engine Oil is good for my 1998 Subaru Impreza GF1?

After I imported the Impreza GF1 from Japan, it was fast and performed optimally. I gave the car to a friend and on return, the cars capability to pick up speed was so compromised, and it struggled to pick up speed from one gear to the next.

I changed the engine oil, fuel filter, oil filter, plugs, battery, air filter with new subaru spares but the situation didn't change so much. help me understand which engine oil is good for my car. now, I am using Caltex Formula I have not crammed the grade .

How can I increase the cars capability to pick up speed??

Thanks for answers.

Check your exhaust system my Impreza slowed to a crawl when I got a leak I did not know about in the exhaust. Got it fixed speed was back oohhh, and dump the friend.

Check with the Sabaru dealer which one is good to enhance the performance of your car.

10W30 on these engines. Open the motor up..allow it to breathe. That will get you the capability to pick up speed. brighten it up if you may be able to too. Subarus are not over engineered with all that crap that adds weight, but I am sure you may be able to find something. Then put on a performance air filter, exhaust header, and dual pipes. Your engine will breathe unlimited and be able to produce a pretty more hp. Also sounds like the fuel filter is plugged up. Sounds like he drove the sh#% out of it.

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