Hey scotty thanks for making your amazing videos , i have MG RX8 and i want to ask if i should use thicker oil the manufacturer recommend 5w30 keep in mind my engine is 2.0T from GM exactly the engine as same as Cadillac XT4 2.0T , i live in middle east and normal temperature is 50c+ ( 125F+ , recently i tried 5W40 and i felt engine got alot quieter , and in cold start the engine stopped shaking ( in cold weather only around 20c , 68F) , so should i stay on 5w40 or should i do as the manufacture says ? , keep in mind i use luqi moly german oil 10K km full synthetic oil and i change it around 4500~5000km , at 5k 5w30 usually get burnt alot faster than 5w40. so witch oil viscosity should i use ? 5W30 or 5W40?.

keep in mind my car millage 32K KM dosent consume oil ,  just around normal 55ml every oil change.

my impression on chinese car ( MG RX8 2020 )

first the engine is originally from GM then opel bought the engine and modified it then SAIC MOTORS ( MG ) bought it from opel and they modified it , the difference is the engine block is from cast iron NOT aluminum  , turbo from Garret USA company , transmission from AISIN 6 speed AUTO originally from toyota prado or fortiner or FJ cruiser , 4WD system from GM ( Borger warner ) you can find it on GMC youkon or Sirrea 2015 , from and rear Solid diff from FORD Ranger , and the wiring and electrinc system from BOSCH such as wiring and colis etc.. , and the good part the car design is body on frame , supention system from McPherson

Things that i hate about MG RX8

transmission cooler is horrible , on 120f ouside the tranny oil temp 106c idealing in P for more than 8min , when you are stuck in traffic or going 140+KM/H tranny temp whould go as high as 117c , and i fixed this issue by installing TRUECOOL 40K and tranny oil temp dropped from 117C to 78c idealing it gone down from 108~ to 68c~72c , second issue i dont know why the manufacture cheapen out on differential oil and used the cheapest option i change the diff oil at 10k km and trust me it was black with tiny bit of unusual shread amount , and cheap oil on transfer case , the fix i repeced them on my own with AMSOIL 80W90 DIFF , AMSOIL ATF RED for transfer case , plus when i was on integrated tranny cooler on the radiator the transmission oil was starting to burn and change to really dark red and i smelled like burnt olive oil , i fixed it by using AMSOIL ATF Blue and Oil cooler.

i know im low millage but i know other people that own the car using cheap oils and normal maintenance they got 270K KM no issues other that things that i described , usually BMW or Mercedes wont last 200k plus due to hot weather really affect there life.

keep in mind i really do take a good care of my car i even care about the turbo after trip more than 10min i do wait 30~60 seconds before shutdown the car just for the turbo to cool down and dont have issues in the future.