1998 Toyota T100 Owners Manual - Page 169
1998 Toyota T100 Manual
Page 169 highlights
T100(U) D Engine continually runs hot; oil pressure gauge stays low If you notice any of these clues, take your vehicle to your Toyota dealer as soon as possible. It probably needs adjustment or repair. CAUTION Do not continue driving with the vehicle unchecked. It could result in serious vehicle damage and possibly personal injury. 169