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Automotive Knowledge Base

The AutoAnvil Reference Hub

Quick-reference specs, diagnostic guides, tool recommendations, and how-to articles — everything a DIY mechanic needs, organized and searchable.

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Quick Reference

Common Torque Specs

Lug nuts (steel wheel)80–100 ft-lb
Lug nuts (alloy wheel)85–110 ft-lb
Spark plugs15–20 ft-lb
Oil drain plug20–30 ft-lb
Brake caliper bolts25–35 ft-lb

OBD2 Code Families

P0xxxPowertrain — generic
P1xxxPowertrain — manufacturer
B0xxxBody
C0xxxChassis
U0xxxNetwork / Bus

Engine Oil Viscosity Guide

0W-20Modern engines, cold climates
5W-30Most passenger cars
5W-40European engines, turbo
10W-30Older engines, warm climates
15W-40Diesel, high-mileage

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