Stop using cheap thermostats. Get an oem honda unit and it will last and work correctly.
Honda Civic parts reviews
Your temp gauge is reading low because your mechanic is not using an OEM Honda thermostat. An OEM thermostat is designed specifically for your engine and the car will warm up quickly and the temp gauge will sit at the 50 yard line in any weather.
I run the Project Mu HC+ and DBA4000 rotors on a FK8 CTR that is also daily driven. over all very happy works ok when cold but 1 or 2 stops and its up to temp and has great bite. and really only minor pad sequel when stone cold.
Rotella T6 5w-40
But if you want the short of it:
ANY high mileage full synthetic 5w-30 oil will do great. Mobil 1? Sure. Amazon Basics? Hell yeah. Wal-Mart's Supertech? Send it.
I dropped some 0W-30 Mobil 1 this winter, and my sol with a d15b7 loved it. Made cold starts very smooth, and noticed no reasons not to continue running it.
I've used only 5w30 full synthetic (usually Mobil 1, sometimes others) since I bought mine 15 years ago (D15B7). Using the high-mileage variety nowadays, supposed to help out the old seals etc. Just over 150k miles but engine runs very smooth so seems to be doing the trick.
I put KYB Excel-G on my 7th gen civic, they seem to ride fine, but for some reason the rear of the car sits an inch or two higher than the original stock suspension.
In March of this year I replaced my battery for 98 Civic Ex with an autozone Ac Delco one. With the colder days I started to notice slower cranks if the car had been sitting a day or longer.
Changing the oil filter on 8th gen Si's is a pain in the ass. You need to stick your entire arm around the exhaust header, axle, and steering rack to get to the filter, and then once you barely get a grip and spin it off, it spews oil all over your axle boot and into the subframe.
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