service my 1.8NA @ 4k without fail normally in 2 months time , all this while using castrol magnatec 10-40 , but last service , backside itchy go try Q8

aduhai , havent reach 4k change alrdy , output was more like air longkang and black ... fast 2 use back castrol ...

IMO - if u always rev ... for semi 4k , fully 7/8k ...