但硫化物會腐蝕VW老車的銅質同步齒輪,造成換檔故障。
因此一般建議VW老車用GL4等級的手排傳動油。
但新一代的GL5傳動油處理了這個問題。
Amsoil公司的銅質腐蝕性檢驗 ASTM D-130 列出以下的安全齒輪油:
Amsoil M/T Fluid MTF..5W-30.............. 1A Light Orange
Red Line MT-90.......75W-90 GL4......... 1A Light Orange
Amsoil Long Life FGR 75W-90 GL5......... 1B Dark Orange
Amsoil Severe Gr SVG 75W-90 GL5....... 1B Dark Orange
Amsoil MT & Gear MTG 75W-90 GL4...... 1B Dark Orange
Mobil 1 Synthetic....75W-90 GL5......... 1B Dark Orange
Castrol Hypoy C......80W-90 GL5......... 1B Dark Orange
Castrol SYNTEC.......75W-90 GL5........ 1B Dark Orange
Citgo Citgear Std XD 75W-90 GL4........ 1B Dark Orange
GM Synthetic Axle....75W-90 GL5........ 1B Dark Orange
Pennzoil Gearplus....80W-90 GL5.......... 1B Dark Orange
Pennzoil Synthetic...75W-90 GL5......... 1B Dark Orange
Red Line NS Gear Oil 75W-90 GL5......... 1B Dark Orange
Red Line 75W90 GL-5..75W-90 GL5....... 1B Dark Orange
Torco SGO Syn G LS....75W-90 GL5...... 1B Dark Orange
Valvoline High Perf..80W-90 GL5........... 1B Dark Orange
Valvoline SynPower...75W-90 GL5......... 1B Dark Orange
安全的油
1A Light Orange: 銅質沒有變色,不含硫化物
1B Dark Orange: 銅質稍稍變色,但沒有腐蝕
腐蝕的油
4B Dark Black: 銅質腐蝕變黑色
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