Car Mechanics (UK) - - Steering Guide -

As with en­gine oil, there are many dif­fer­ent PAS hy­draulic fluid spec­i­fi­ca­tions. Mix­ing in­com­pat­i­ble flu­ids to­gether can cause se­ri­ous dam­age, not least to the sys­tem’s rub­ber seals. While you should heed the spec­i­fi­ca­tions given in your car hand­book, ad­vice about man­u­fac­turerbranded fluid can be un­help­ful, es­pe­cially if it has be­come ob­so­lete.

In gen­eral, three types of fluid are avail­able. The most com­monly used au­to­matic trans­mis­sion fluid (ATF) is usu­ally red in colour; sev­eral grades are man­u­fac­tured, but they tend to be com­pat­i­ble with each other. How­ever, dou­ble-check with your sup­plier.

De­signed specif­i­cally to be ex­posed to higher tem­per­a­tures and loads than ATF, cen­tral hy­draulic fluid (CHF) has usu­ally a light yel­low hue, al­though some dif­fer­ent colours ex­ist. CHF tends to be used more com­monly with elec­tro-hy­draulic sys­tems.

Fi­nally, liq­uide hy­draulique minéral (LHM) is used on very old Citroëns, the last of which was the Xan­tia. C5/C6 mod­els es­pe­cially used liq­uide hy­draulique syn­thé­tique (LHS), a type of CHF made by To­tal Lu­bri­cants.

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